David Letterman dropped a bombshell in the fall of 2009 when he admitted <a href="http://www.cnn.com/2009/SHOWBIZ/TV/10/01/letterman.allegations/index.html" target="_blank">on his CBS late night talk show</a> that he'd had affairs with a number of women on his staff. During a live taping of the show, <a href="http://www.cnn.com/2009/SHOWBIZ/TV/10/06/letterman.apology/index.html?iref=allsearch" target="_blank">Letterman first took several shots at himself</a>, and then <a href="https://www.youtube.com/watch?v=BlBzi3GWWRg&feature=kp" target="_blank" target="_blank">grew more serious</a>: "I'm terribly sorry that I put the staff in that position," he said. "My wife, Regina, has been horribly hurt by my behavior ... Let me tell you folks, I've got my work cut out for me." Earlier that summer, <a href="http://abcnews.go.com/Entertainment/Politics/story?id=7849798" target="_blank" target="_blank">Letterman also said he was sorry to Sarah Palin</a> for what he called "a bad joke."