#4) Rob Van Dam - The X-Files
Rob Van Dam is a bit of a strange case. He looks like the actor, Jean-Claude Van Damme, and his name is quite similar to the actor's name, and the two men share a love for martial arts, but they aren't related. Which is what makes RVD's appearance in a random episode of hit TV show, The X-Files, even stranger.
It's not like he had a family relation in the business to get him the role, but nevertheless, the master of the Five Star Frog Splash enjoyed a brief and unexpected cameo on the show years ago, when it was still on the air.