In honor of tonight's Late Show finale, we've drummed up 10 interesting facts you probably didn't know about David Letterman and the famous talk show!
Click through the gallery above to see.
Dave's friend Bill was his first-ever guest on Late Night with David Letterman — which ran on NBC from 1982 until 1993 — on Feb. 1, 1982. He then served as the star's Late Show debut guest on CBS on Aug. 30, 1993, and provided the show's final interview on May 19, 2015. Over the years, Bill appeared with Dave 44 times!