Jimmy Fallon & John Krasinski Have A Lip Sync Battle With Katy Perry, Boyz-II-Men, And More!

OMG!
We DARE YOU not to start playing this game with your friends!
John Krasinski invented Lip Sync-Off! But can Jimmy Fallon beat him at his own game?
Ch-ch-check out the video (above) to see the HIGHlarious new game that’s sure to be a hit at every party we ever throw!
How amazing is John Krasinski?? Totally jelly, Emily Blunt!