Hrrmmm...
While that guy clearly lost it, there's probably more to the story. A lot of college students are make life difficult for their Professors *in class*.
I remember when I was taking physics, there was this one girl who sat in front of me who would always get a call on her cell phone in the middle of class. 'm not joking, this happened almost every day. She would stand up, walk down the aisle, past the professor, and out into the hallway to continue her conversation. Unbelievably distracting and rude. Took up a good 1 minute of class time whenever it happened, and there were about 120 people in the class. But the Prof. never said a word. He just kept quiet. I don't see how he managed to keep his cool, because I would have told the bitch not to come back.