For four years, Keith Olbermann has closed out his MSNBC show with a signature line, which normally went like this: "That's Countdown, for this, the 2,576th day since the previous president declared 'Mission Accomplished' in Iraq."

Well, you know the old saying: 2,576 is enough. The cable host quietly retired his daily mocking of President Bush's flight suit photo op on his May 20 show and has swapped it with a new line about the BP oil spill. On Monday, May 20, Olbermann ended his broadcast like so: "And that is Countdown for this, the 34th day since the Deep Water Horizon oil spill disaster began. I'm Keith Olbermann. Good night and good luck." Watch (via Mediaite):