Last night (May 20), 'The Tonight Show Starring Jimmy Fallon' hosted a game of charades that included actors Charlize Theron and Josh Hartnett. We won't reveal who won, but we will tell you this: It. Was. Hilarious.

Charlize is always fun to watch in interviews, but this game let her really play up her goofy side. We were cracking up as we watched her effortlessly fly through her clues.

Josh, who was brought onstage as a surprise guest, proved to be amazing at guessing what Jimmy was miming. Seriously, Josh was throwing down rapid-fire suggestions and got totally into the game.

The highlight of the segment, however, is when Charlize and Josh go head-to-head in the last round. We love that they're completely ruthless and competitive throughout the entire game of charades. (And Jimmy's commentary had us in stitches!)

Who do you think did the best job at charades? Check out the LOLZ-worthy video above!