David Arquette
Arquette played a wrestling fan in the movie Ready to Rumble. To market this movie, WCW hired Arquette to appear on their TV show and win their world title. Arquette argued he should not win the belt because he is not a real wrestler but WCW talked him into it. The attention received was only negative and the backlash eventually caused WCW to go out of business. The movie was also a critical disaster that ruined the careers of some of the actors in it, like Oliver Platt.