Originally posted by: Orsorum
I've been confronted a number of times in my current line of work (I'm an RA); basically all I do is remain calm, inform them that they're currently threatening a University employee, which could get them expelled, and that they'll be speaking with the PD shortly - they can either have a chat or spend a night, minimum, in jail, depending on their course of action. It's worked pretty well for the last two years.
I had a student threaten me once when I was teaching. He was an ass and I was hoping he'd hit me. I was ready to take a fall to let him ride his expulsion out. He didn't swing, though.