David Letterman Crashes 'Tonight Show'

“The Tonight Show” started Monday off with a surprise appearance from the now-retired David Letterman, who poked fun at Jimmy Fallon while reuniting with bandleader 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 ...