The trio kicked back in the actual frat house from the movie, playing Mario Kart 8 for the Wii. To make things a bit more interesting, the loser of every race got a penis drawn onto his face (because, let's face it, adult men are secretly middle school boys in disguise). Naturally, O'Brien lost the majority of the rounds, resulting in a face plastered with Efron's and Rogen's handiwork.
"Before we draw any genitalia, this is television and we have to follow a certain code," O'Brien said, as a giant poster depicting acceptable and non-acceptable hand-drawn penis designs appeared.
After Efron got a little graphic with his artwork on O'Brien's face, the TV host learned they couldn't actually show it. Without missing a beat, Efron asked, "What if they're music notes?" and then cleverly altered his work of art. Watch the hilarity below.