Last night, after 33 years and more than 6,000 shows, David Letterman finally wrapped up his run as host of the Late Show. It was, truly, the end of an era. And while oceans of ink are certainly being spilled over the sardonic host's legacy, his final moments cut through all the chatter like a knife. Like the decades that preceded it, the final send-off was both sweet and just a little sharp, a reminder that, at 68 years old, there's still some bite in the old boy. Watch the final moments, above.