"Gangnam Style" is the year's biggest viral dance sensation. Now it's also its most deadly — and not because it drove someone insane from overexposure. A 46-year-old man attempting the dance — created and popularized by Korean rapper Psy — at his office party collapsed with chest pains and died over the weekend, prompting a warning from a cardiologist:

Professor Bernard Keavney, a consultant cardiologist at Newcastle University, has warned older men not to "stray outside your comfort zone" while dancing at their Christmas parties this year.

"The chance that you'll come to grief is very small. But as with any form of untypical exercise … be somewhat measured. Let the lady dance around you," he told The Daily Telegraph.

So, out-of-shape guys: if you want to have fun at holiday parties by imitating Psy, stay away from his cardiac-intensive dance moves and stick to the easy stuff, like calling for the death of U.S. military service members.