Mickey Rourke
Mickey Rourke wanted to be a boxer, not an actor. He only started acting after his doctors told him he had to take a year off from the ring. He started getting work as an actor, but he quickly earned a reputation for being erratic and difficult on set.
In 1991, he decided he “had to go back to boxing”. He proceeded to undefeated in eight fights before returning to acting—although even after all his reconstructive surgery, his face would never look the same again.