After over 6,000 shows, Late Show With David Letterman [1] is over for good. His final show was chock-full of fantastic things, including a performance from Foo Fighters [2], a star-studded Top 10 List [3], and an appearance from President Obama [4]. The tenured host took some time out to thank everyone who has ever helped him in his career with a final goodbye and goodnight message. Warning: if you've been a loyal fan of Letterman's over the past several decades, this might hit you right in the gut. Watch below.