Emma Stone is a great lip syncher, but a liar, not so much.
How the game works is both players must take turns trying to stump each other about what item is hidden inside their mystery boxes. In an attempt to fool Fallon, Stone lied about the Frozen DVD that was cleverly frozen in an ice cube in front of her. Fallon was quick to call her bluff, and earned a point for himself.
When it was The Tonight Show host's turn to pick a box, he too lied and told Stone he had a tiny squirrel surfing a bed of lettuce. He really had a fake hand with a wrist watch on it. Yeah, this game gets weird.
Fallon somehow convinced Stone of the surfing squirrel and in turn won the game.
Check out the power of Fallon and his star-studded Tonight Show moments, below.