John Oliver’s not the only talk show host who can drop in on another show unexpectedly. Last night, the great David Letterman made a rare appearance on the Tonight Show right in the middle of Jimmy Fallon’s monologue.

It was a night of surprise returns on late-night Monday (February 10), as not only did John Oliver make a surprise appearance on The Daily Show, but talk show legend David Letterman returned to The Tonight Show.

Letterman crashed Jimmy Fallon’s Tonight Show monologue Monday night, wandering onto the stage as Fallon was making some jokes about Sunday’s Super Bowl. “Is this the 23rd hour of the Today show?” Letterman asked.