Need a Hand? Jimmy Fallon Slaps Jake Gyllenhaal with a Ginormous Palm on The Tonight Show

07/22/2015 AT 12:20 PM EDT

Jake Gyllenhaal learned how to take a punch as boxer Billy Hope in his new movie Southpaw, but taking a slap from Jimmy Fallon's giant hand is another thing.

On Tuesday night's The Tonight Show, the host challenged the actor to a game of "Slapjack," which "works the same as blackjack but at the end of each round the winner gets to slap the loser across the face with a giant prosthetic hand," Fallon explains.

"Why don't I get one?" asks Gyllenhaal at the beginning of the clip when Fallon is sporting a huge hand and he is not.

"Your hand's big enough," quips Fallon.



"Anything with big hands, I'm into," jokes Gyllenhaal, who ended up winning round one and surprising Fallon by smacking him in the head with his own super southpaw.

"You knocked my hairpiece off," says Fallon, before smoothing his hair with his own big hand.

Still sporting a bandage on his finger, Fallon even makes fun of his own recent hand injury, as he has trouble flipping the cards.

But the host goes on to win the next two rounds and wallop Gyllenhaal twice upside the head.

"People have asked me, 'What does it feel like to get hit?' " the actor says to Fallon after taking the blows, referencing his movie, which opens July 24. "I really never know how to explain it."

Concludes Gyllenhaal: "But I really don't understand how to explain how that feels."
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