David Letterman Crashes 'The Tonight Show,' Refuses to Read Fallon's Jokes | Video
John Oliver wasn't the only late night icon to crash this week. "The Tonight Show" started Monday off with a surprise ...
David Letterman Makes Shock Return to ‘The Tonight Show’ & Reunites With Paul Shaffer
Fallon was riffing with Paul Shaffer and the World’s Most Dangerous Band, Letterman’s longtime sidekick and band from his time hosting CBS’ Late Show from 1982 to 2015 — Shaffer and co were filling in ...