Comedy legends Robert Deniro and Zac Effron team up for "Dirty Grandpa" and we watched it so you don't have to! Was Grandpa too Tough and not Dirty enough? Who should have played Dirty Grandpa? Did this movie turn Aubrey Plaza into a bigscreen sex bombshell? Was Jason Mantzoukas enough to save the film? And why was Zac Effron even in this? We answer those questions and more on a "How to Watch Dirty Grandpa" edition of the show!