Biggest Celebrity Oops! 20 - 1

20. Cher does infomercials 19. Arnold Schwarzenegger gropes women 18. Sex tapes: Pamela Anderson & Tommy Lee; Paris Hilton 17. Oprah Winfrey sings her show's theme song 16. Russell Crowe beats someone up at BAFTA Awards for cutting off his speech 15. TV shows in decline: Andrew is born on Family Ties; Tony and Angela become a couple on Who's the Boss?; Shannen Doherty leaves Beverly Hills, 90210; David and Maddie do it on Moonlighting; Bobby Ewing appears in shower and renders entire Dallas season a dream 14. Jessica Simpson says stupid things 13. ""The Real Cancun"" 12. Flops from former Seinfeld stars: The Michael Richards Show, Jason Alexander in Bob Patterson, Julia Louis-Dreyfus in Watching Ellie 11. Stars prematurely leaving shows: Farrah Fawcett - Charlie's Angels; Suzanne Somers - Three's Company; Valerie Harper - Valerie 10. Kathie Lee Gifford leaves Live With Regis and Kathie Lee 9. Actors turn down roles: John Travolta - ""Chicago""