Jack Black has officially taken all the focus off Sarah Palin with his latest appearance on David Letterman. Monday night, Jack was promoting his new movie, Year One, when he broke out into song and dropped the f-bomb.

Typically Dave’s people would have censored the foul language…but this one slipped through the cracks. Since it was after 10 pm, they are both in the clear with the FCC. We’re just glad there is a new buzz about Letterman, and it has nothing to do with Sarah Palin.