One thing that always manages to phase me. Is the silence immediately after a confrontation any kind anywhere. I hate it when i find myself in a room again after a confrontation and the other person acts like it never happened. I always feel like they are waiting for me to say something that would set them off, but at the same same time i expect the same from them. It's like being in a room full of dynamite waiting for someone to drop a match.
I like to take a stance of strict retaliation i don't like instigators, and i refuse to be one.
The foot in mouth moments. I say something and immediately realize it's inappropriateness. Oops wrong occasion, wrong crowd, forgot who you were talking to etc.