"Is this the 23rd hour of The Today Show?,” Letterman asked as he wandered onto the stage to greet Jimmy Fallon.

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

John Oliver wasn't the only late night icon to crash this week. "The Tonight Show" started Monday off with a surprise ...

On Feb. 10, David Letterman stopped by “The Tonight Show Starring Jimmy Fallon” while his former bandleader, Paul Shaffer, ...

NEW YORK CITY, NEW YORK: Legendary late-night TV icon David Letterman gate-crashed Jimmy Fallon 's 'Tonight Show' monologue on Monday night, February 10, strolling onto the stage while the host was ...

The appearance from the former Late Night and Late Show host offered a reunion with bandleader Paul Shaffer, who is sitting in with his World’s Most Dangerous Band on The Tonight Show this week. The ...

David Letterman made a surprise appearance on The Tonight Show, crashing Jimmy Fallon's monologue to tell a few jokes and ...

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 ...

TV legend David Letterman returned to his former stomping grounds at 30 Rockefeller Plaza Monday for a surprise appearance on ...

Feb. 11 (UPI) -- David Letterman joined Jimmy Fallon during his monologue on The Tonight Show Monday. "Is this the 23rd hour of the Today show?" asked the former Late Show host, feigning confusion, ...

Around the 3:47 mark of Jimmy Fallon's monologue on Monday's The Tonight Show, David Letterman came out of retirement to crash the party. "Is this the 23rd hour of the Today Show?" he quipped, before ...