First he had all the questions in the world, and then once he got going he couldn't help but get fully invested (which is what we like to see in anyone playing parlour games).
Leary was on Fallon last night and joined in 'Pretty Little Liars' star Shay Mitchell and G-Eazy for a game of 'Catchphrase' that started with a barrage of questions that would have left you thinking that Leary was going to fail miserably but, thanks to Mitchell's lack of knowledge on Guns N' Roses, he and Fallon came out on top.
He also celebrates hard when he wins, which is what we call a bad winner (and is something that we don't usually like to see but looks well on Leary so we'll let it slide).