Bret Michaels (Poison)

A lifelong diabetic, Michaels has survived everything from car crashes to having a descending prop wall crash on top of his head, but his biggest heath scares came in 2010. While getting emergency treatment for a subarachnoid hemorrhage, doctors discovered that the Poison icon had a hole in his heart ... literally. Since then, the 49-year-old rocker has fully recovered and spends much of his spare time raising money for various health-related causes.