January Jones isn't afraid of cracking Betty Draper's icy veneer when she's not in character. Case in point: on last night's Late Night With Jimmy Fallon, she summoned her inner frat boy and challenged the host to a rousing game of beer pong. According to New York's Culture Vulture, "She engaged Fallon in a healthy round of trash talk before, during, and after ... mainly berating him for playing a watered-down version of the so-called sport."