Due Date trailer, you guys: The best part about The Hangover was Zach Galifianakis. No duh. (Oh, wait, what were you going to say? Mike Tyson's annoying cameo? You're wrong. The best part wasn't Mike Tyson's annoying cameo.) Still, he was underutilized in that movie. Now that he has been introduced to America, though, we can finally take the SHACKLES ...