Bill Murray, the first guest on David Letterman’s Late Show when it premiered on CBS August 30, 1993, will visit the show to celebrate its 20 years on the network Thursday. It’ll be a nice break for the media from The Summer of Jay Leno, as the NBC late-night host continues to dominate in the demo this summer while taking his last last lap before being replaced — again — on The Tonight Show — this time by Jimmy Fallon. Murray also was Letterman’s first guest on Late Night when it debuted on NBC in 1982 — making Letterman the longest-running late-night TV host in history at 31 years and counting.