I just had it happen for the second time in 3 years, today. The first one wasn't that bad, because the guy didn't scare me. The one today...I think might really try. He came into my office today, I was there alone, and I didn't have what he came for. We owe him money for work he did, but he hasn't given us a bill, which I requested. So he gets more and more irate over this, goes into talking about how he used to be a bad man and crap. Our company is set up on Instant Messenger, so I IM'ed our Corp admin and told her to call the police and send them to my office if I didn't respond within 15 mintues...and I started to think that might even be too late. Luckily as the guy was getting closer to me, and more and more irate, (had me cornered in my office) a delivery guy came in, and the guy turned, told the delivery guy "you just saved his ass", and left, shouting "I'll be back".
I'm filing a police report and taking out a warrant right now, but it's still enough to shake you up.
Y'know, sometimes I think I'm crazy...then I meet somebody that makes me think I'm pretty OK.
WLG