It’s a stomach-churning video – a young woman turning a silicone buttock implant around and around under her skin and wondering out loud if this could possibly be right.

It’s not, says Dr. Anthony Youn, a Michigan-based plastic surgeon who runs the blog Celebrity Cosmetic Surgery. “It’s pretty shocking,” Youn says.

NBC News was unable to contact the unidentified woman in the video, but Youn said he thinks it’s for real. “When she moves the implant around, it’s shaped like a real buttock implant,” he says.

An increase in the demand for such procedures means surgery-gone-horribly-wrong cases are almost certain to be on the rise, Youn says.

“A lot of people want it but they don’t have the money, so they take it upon themselves to inject substances like silicone,” Youn said in a telephone interview.

“If it’s not performed almost perfectly, you could have major problems.”

“Major problems” can include death. In Feb. 2011, a 20-year-old British woman died in Philadelphia after getting a bargain-basement buttock enhancement procedure in her hotel room. Just weeks before, 36-year-old Whalesca Castillo was arrested for operating without a license and injecting women’s breasts and buttocks with liquid silicone from her home in the Bronx. She was sentenced to a year in prison after pleading guilty this past June.

In July, Oneal Ron Morris of Miami was charged with manslaughter in the death last March of Shatarka Nuby, 31. Morris was already facing charges of practicing health care and without a license and causing serious bodily injury for allegedly injecting at least two women with a toxic mixture of Fix-a-Flat tire sealant, mineral oil and cement in a backroom attempt at buttock enhancement. Nuby died after receiving injections to enlarge her breasts, allegedly from Oneal.

The American Society for Aesthetic Plastic Surgery has a long list of such incidents. “Disturbing reports of patients being injected with everything from liquid silicone to baby oil and other unapproved products are appearing in the press on a regular basis," the group says on its website. "Make sure your clinician is using only FDA-approved products purchased within the United States. If he or she refuses to give you this information, seek another clinician.”

Gluteal enhancement – known colloquially as “butt implants” -- are among the more unusual cosmetic procedures that people ask for but are becoming more common, according to the American Society for Plastic Surgeons.

Its data shows that in 2011, 1,149 people got buttock implants, compared to 806 in 2010. There are no statistics for earlier years. That compares to 4,546 people who got buttock lifts in 2011, and 301,000 who got breast augmentation. The  American Society for Aesthetic Plastic Surgery counted 2,100 buttock augmentation procedures in 2004.

When so many people are trying to lose weight, why the pursuit of a larger derriere? “It really started with J-Lo,” says Youn. Singer Jennifer Lopez is known for her curves – especially her shapely bottom. “Part of it is cultural, I think,” added Youn. “We have a popular culture that puts an emphasis on the size of the buttocks.”

He points to Kate Middleton’s younger sister Pippa, whose profile in a tight dress grabbed attention at Middleton’s 2011 wedding to Britain’s Prince William -- but the phenomenon goes back even farther, to Sir Mix-a-Lot’s 1992 hit “Baby Got Back,” which starts with the line “I like big butts”.

For people who want such enhancements, it’s important to go to a professional with a lot of experience, Youn says. Board certified plastic surgeons are members of the American Society for Plastic Surgeons or the American Society for Aesthetic Plastic Surgery, or both. “And you want to make sure they do a lot of these every year. It’s not for the novice doctor,” Youn advises.

Youn says he won’t do buttock implants, but will inject fat to enhance various body areas. A lot can go wrong, he said.

“One reason it is fraught with complications is the area where you put the implant, we consider it a dirty area,” Youn said. “Implants, if they get any type of bacteria on them, can get infected very easily.”

And that can cause a complication no one wants. “When implants get infected they can literally extrude. The body can open the incision and try to push it back out,” he said.

Second, the gluteus maximus is the largest muscle in the body, and needs big blood vessels to supply it. If silicone gets into the blood, it can cause embolisms, which are painful and potentially deadly if they end up in the heart or brain.

The operation itself isn’t fun. “It is a painful operation because you have to sit on that area,” Youn said. “You have to literally avoid sitting on your bottom for weeks afterward.”

Or something might happen like the YouTube video shows.  

“If the pocket that the implant was put in is too big, then the implant will move around like that,” Youn says. “I have seen it with breast implants. You can literally flip the implant around in your breast.”

Buttock implants are shaped with one rounded side and one flat side, Youn said, “You want to put it in the buttocks like a hand in a glove where it really doesn’t move.”

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There's really no other way to put this: During a Pilates stretching exercise, a 59-year-old woman said her body "swallowed" one of her breast implants. Sounds like something we just made up, but the woman's case is the subject of an unbelievable report, just published online in the latest New England Journal of Medicine. 

The woman was a breast cancer survivor who'd had a double mastectomy, and afterward had gotten breast implants. During a Pilates routine, she was doing a Valsalva maneuver, a breathing technique in which a person takes a deep breath and holds it while bearing down. (In other words, you're going through the motions of exhaling forcibly, but without letting any air escaping through the mouth or nose.)

Doing a Valsalva maneuver increases pressure inside your chest cavity. In this lady's case, enough pressure built to essentially send her right implant through the thin tissue between her ribs and into the space in between the lungs. This left her more perplexed than anything -- where did it go?! Fortunately (and incredibly), she said upon arriving in the the emergency department of the Johns Hopkins Hospital in Baltimore that she wasn't experiencing any chest pain or shortness of breath. 

"I can picture how this could happen in a freak occurrence," says Dr. Anthony Youn, a Michigan-based cosmetic surgeon and frequent contributor to msnbc.com, who didn't treat this patient but gave us his professional opinion on what the heck happened here.

Note that Youn called this a "freak occurrence" -- this is not exactly going to happen to your average Pilates lover, as this woman's case had some extra complications. She'd recently undergone a surgery to repair her heart's mitral valve, a procedure that typically involves some separating of the muscles that run between the ribs. 

"What likely happened in this instance is that the breast implant was placed under the chest muscle and on top of the ribs, an extremely common practice in breast reconstruction," Youn says. "When the patient Valsalva'd, the pectoralis (chest) muscle likely contracted and pushed the implant through the space between her ribs," which was particularly fragile after the valve surgery.

"The weakened scar tissue was easily torn, and the strength of the pectoralis muscle pushed the implant deep into her chest," Youn explains. 

The woman was treated at Johns Hopkins, where surgeons retrieved the implant from within her chest and put it back where it belonged. 

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Miami Gardens Police via NBC Miami

Oneal Ron Morris, shown after her arrest, is accused of injecting a victim's buttocks with a mixture of cement, Fix-A-Flat, mineral oil and Superglue.

News that Oneal Ron Morris was arrested for injecting a woman’s buttocks with a combination of cement, Fix-A-Flat, mineral oil and Superglue stunned readers. But even more shocking are the photographs of the alleged perpetrator that reveal the incredible size of her rear end. Her curves would make Jessica Rabbit blush! While the vast majority of the population inquiring about buttock enhancement would refuse treatment by an fake physician, photos reveal that Morris likely acted as a walking advertisement for her illegal practice.

So just how did Morris’s behind become so massive? I truly doubt that she partook in her own dangerous cocktail of injections. While these substances may work for repaving a road or patching a tire, they are dangerous when injected into living tissue. She would have likely found herself in the hospital (like her alleged victim) with large, festering wounds. In addition, the two traditional techniques of buttock augmentation -- solid silicone implants and fat injections -- are unlikely to have dramatic enough results to create proportions such as hers.

As a cosmetic surgeon making an educated guess, I suspect Morris, a 30-year-old transgender woman, maximally enhanced her buttocks using polypropylene string implants obtained overseas or through the black market.

Polypropylene string implants were used to enhance breasts back in the late 1990s prior to being banned by the FDA in 2001.  These implants consist of yarn-like string that gradually absorbs water and expands in size when surgically implanted into the body.  If these string implants are in place long enough, they can result in a massive, cartoonish enlargement, as can be seen in the breasts of a handful of adult entertainers.

While I’ve never heard of polypropylene being implanted into the buttocks, it’s very possible Morris underwent this procedure. The best treatment for polypropylene string implants is surgical removal.

If Morris does have polypropylene string implants and does not have them removed, she can expect her buttocks to continue to grow until they eventually drag on the ground.

Dr. Anthony Youn is a board-certified cosmetic surgeon in the Detroit area who has been featured on "Dr. 90210" and runs a popular celebrity cosmetic surgery blog. He is the author of the new, irreverent memoir "In Stitches."

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Is it reassuring that a surgeon has the precision of a competitive knife thrower? Or is the thought of letting a knife-throwing plastic surgeon near your breasts kind of terrifying?

On his off hours, Dr. Ted Eisenberg of Merion Park, Pa., throws knives and tomahawks in competition. But he's also set a Guinness World Record for most boob jobs performed.

According to Guinness, Eisenberg has performed 3,460 breast augmentations, reports AOL News. Eisenberg argues that he's done more than 4,700 of the surgeries over his cosmetic surgery career. Depending on whether you go by Guinness's count or Eisenberg's -- that's either 7,000 or close to 10,000 boobs.

We should note that the knife-throwing surgeon hasn't lost his heart. When he got his first throwing knife -- a gift from his wife -- he told AOL News, "I tried throwing it into a tree but I felt bad. I felt so bad I went and hugged the tree."

For more weird world records, check out TODAY.com's slideshow of 2011's Guinness World Records holders. 

[Link: AOL News: Philadelphia Breast Surgeon Moonlights as Knife Thrower]

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