PEOPLE Pop Quiz: Family Squares

Judy Greer and the rest of the ‘Family Squares’ fam keep in touch thanks to a new episode of PEOPLE Pop Quiz and end up revealing which of them has moonlighted as a private investigator. The cast, including Henry Winkler, Casey Wilson, Margo Martindale, Scott MacArthur, and Timothy Simons, admit who struggles the most with the mute button, recall studying the art of clowning in college, and discover which of them is a close personal friend of Donald Duck.