You know what really grinds my gears? Over-zealous authority figures like cops, professors and other people with power. What I mean is this:
A cop sees a kid littering, tells the kid politely not to litter. Kid says he wasn't littering, but he missed the trashcan. Cop then proceeds to take out stun gun and taze the poor kid and then lock him up.
Seriously, I hate it when authority figures abuse their power just to look cool in front of their buddies.
Recently, I have gotten suspended for joking around with my buddies. All I said was "I will shoot you in the head with a golden Uzi in COD4!" and professor heard me and yelled at me, then gave me about 2 day suspension out of college.
Why? It wasn't a threat.
Damn it all.