I know people who go back and check themselves, but it drives me crazy. Everybody wants to look in the mirror and see Cary Grant looking back at them, but that's just not the case.
As Jeopardy devotees know, if you're trying to win on the show, the buzzer is all. On any given night, nearly all the contestants know nearly all the answers, so it's just a matter of who masters buzzer rhythm the best.