David Lee Roth
Frontman/crazy person for Van Halen, David Lee Roth has studied a variety of martial arts, including karate and kung fu. He even runs classes in martial arts. Watch this video to see Roth applying his skills in the real world.
Jose Canseco
Jose Canseco, a former baseball slugger who has acknowledged to using performance-enhancing drugs, has competed professionally in mixed martial arts. Canseco was indeed the one who challenged basketball legend Shaq to compete in an MMA contest!