David Letterman

Last week saw Dave Letterman shaking up the late-night landscape with the announcement of his imminent retirement, which as since led to all manner of speculation on a replacement, but the impact has already gone further down the pop culture rabbit hole. Watch 'The Simpsons' pay tribute to the retiring 'Late Show' leader with last night's couch gag from "Luca$"!

We all knew the day was coming sooner, than later, when David Letterman would announce his retirement.  That day has come, and it stings, as we begin to digest the thought the end is in sight. Do you realize, for over three decades this icon has been strolling out on the stage to the music led by his sidekick, Paul Schaffer...