David Letterman and John Oliver both paid surprise visits to their old stomping grounds Monday night. Bill Carter reports.

TV legend David Letterman made a surprise appearance on NBC’s “Tonight Show” on Monday night during host Jimmy Fallon’s ...

David Letterman made a surprise cameo on The Tonight Show Starring Jimmy Fallon on Feb. 10, interrupting Fallon's monologue ...

While Paul Shaffer filled in the for The Roots on “The Tonight Show Starring Jimmy Fallon,” he was reunited with a surprise guest: David Letterman!

Show is turning green on Tuesday. Jimmy Fallon is set to entertain Philadelphia Eagles quarterback and Super Bowl MVP Jalen ...

"I don't know if you knew this—this is new," Spade shared. Soon after, Fallon chimed in unexpectedly, "This is the new. I had an idea." Spade added, "You're the 19th host." Fallon again barged into ...