Jimmy Fallon, Gerard Butler play Slapjack on Tonight Show

When Gerard Butler took the stage for Thursday’s episode of The Tonight Show, he was treated to Jimmy Fallon’s latest wacky game: Slapjack. It’s a lot like blackjack, except the winner of each round gets to slap the loser with a giant prosthetic hand. Butler got things off to a good start by immediately quipping, “Finally, a hand I can hold my penis with,” which required Fallon to temporarily walk off to compose himself.

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Butler paid for it the first round, however. After Fallon hit 21, he told his guest, “Thanks so much for coming on the show, you’re the best, man,” and then slapped him with his giant hand. The second round seemed to end in a tie, so the two players automatically hit each other at the same time before Fallon allowed Butler to actually slap him. Butler ended up winning the last round, and his final slap actually knocked Fallon out of his chair.

Watch the full clip below.