Since Matt is such a great actor, we were excited to see how he’d do in a game of Box of Lies! But despite his Rounders experience, the 45-year-old apparently has a pretty bad poker face!
Though Ben Affleck‘s bestie sounded pretty convincing, Jimmy was able to see right through the Oscar winner and the SNL alum even did his best to trick the Good Will Hunting star when he got the chance!
Ch-ch-check out the HIGHlarious game (below) as Damon and Fallon do their best to fool each other!
Make sure to watch The Tonight Show weeknights at 11:35 p.m. EST on NBC!