If you thought Christian Bale's outburst while filming Terminator Salvation was the lowest all-time moment on the set of a McG movie, well, then, you haven't heard the story of the time the director was "headbutted by an A-list star, square in the head." Before you Lucy Liu haters out there pounce, the reporter interviewing McG was able to get him to confess who did the head-butting. "Nah, I probably shouldn't [reveal any names] but it was Bill Murray." [Playlist]