Chris Pratt has been hamming it up on his Passengers press tour with Jennifer Lawrence, and on Tuesday, the actor stopped by The Tonight Show Starring Jimmy Fallon to promote the film. After discussing the sci-fi romance, Chris and Jimmy Fallon performed a Christmas-themed Mad Libs Theater skit, and the two could barely keep it together. Between the hilarious script and Chris and Jimmy's constant giggles, you'll have a hard time not laughing, too.