We knew Jake Gyllenhaal transformed his body for the Southpaw movie, but this is ridiculous!
The actor stopped by The Tonight Show on Tuesday where he played a round of the giant handed face smacking card game Slapjack!
[ Video: Jimmy And Mark Wahlberg Play Slapjack ]
And he whacked Jimmy Fallon so hard, you'd think he played Taylor Swift as his intro music or something! LOLz!
Ch-ch-check out the video (above) to see all the...