My bad experience was at a local Tim Horton's (Dundas and Egerton, for those who know the significance, check the webcam). I had been playing guitar and just wanted a quick coffee. I didn't really dress up, just kilt, flip-flops, sporran and tshirt. I wasn't intending to get out of the car. The drive through was being repaired so I had to walk in. While standing in line I noticed several bikers leering, snickering, whatever, discussing me. I wasn't in a good mood and, I don't know why I did this, but I extended my middle finger down while my hand was closed at my side. Before I realized fully what I had done, they started and were real quiet. Then they sort of grinned and went back to their own conversation.
I live that way, I've been lucky too long. One of these days that's going to catch up with me.

I guess I'm saying the line to abrupt responses stops just before giving the finger to bikers.