Arnie was at the 'Arnold Classic Africa' sporting event last week, and was doing a snapchat thing with some fans when this guy comes running up behind him and literally dropkicks him for no apparent reason.
Except that the "drop" part didn't quite work, Arnie barely even moved, and said later that he didn't even realize what had happened, he thought he'd just been jostled by the crowd. (Obviously just PR though, not wanting to make a big deal of the situation).