Sensible advice, ChuffingHell. Just keep calm and if they become aggressive, don't reciprocate - it'll just make you look bad if you do.
I once handed in notice to someone I had decided I really couldn't work with any longer, and I explained in the letter resignation that I was leaving because I felt could no longer work with him. The resignation took him by surprise, but he asked me later if I'd like to discuss it with him. I said there was nothing to discuss, as I'd already said it all in my letter. I have it on good authority he was nearly cacking his pants when I went off for my exit interview (this was NHS - he was a charge nurse). Oh boy, that felt good!!