So there's David Letterman, hanging out with George Clooney on The Late Show just before his retirement, looking like David Letterman. And here's David Letterman today... Look at the sheer joy on the man's face. Like someone who's been released from prison and is now charging up the strand in St. Barts. Retirement obviously suits you, sir, keep it up. 

Reaction from twitter, of course, has been mixed...

And he looks happy as hell.