John Krasinski stopped by Late Night with Jimmy Fallon on Tuesday night to promote the final two episodes of The Office, and he came with a little something extra up his sleeve, challenging the show's host to a lip sync battle.
The actor and Fallon traded runs "performing" hit songs by Boyz II Men, Katy Perry, Run-D.M.C. and others. While watching them go back and forth—with stunning precision, The Roots' Questlove adds to the hilarity, as the camera frequently catches the drummer trying to control his laughter.
Watch the clip below.