WTF, I'll get it started...
1> People who stand and chitchat with each other in front of escalators, doorways, elevators, etc. (I have a tendency to bodycheck those fuckers)
2> People with fucking chipmunk singing or other loud annoying shit for ringtones.
3> People in public service roles (i.e. retail, customer service, etc.) who can't understand fucking plain English.
4> People who don't look where they are walking cuz they are trying to text and walk at the same time.
5> People who make really, and I mean really stupid comments on a regular basis. I once heard a young fellow seriously pondering out loud what would happen if he put his head in a nuker and turned it on. I told him I could over-ride the safety mechanism if he really wanted to find out.
6> Anyone with an IQ under 120 (Especially those who are way under).
That's my shortlist...
Why? Cuz I said so, that's why!