On many occasions a losing contestant has been asked back because of a "production mistake." Has a losing contestant ever been asked to return because he/she was partnered with a celebrity who seemingly threw the game or didn't make any effort to win? I know celebrities can make honest mistakes like giving a two-word clue on Password or accidentally using a part of the clue on Pyramid, but sometimes they say something so stupid (Tom Poston saying "wronger" to the contestant's clue "writer") that deliberately causes a loss. I don't think a contestant should be penalized for something like that, but I also know it would be hard to prove that the celebrity screwed up on purpose.