In no particular order:
1. Coffee lids with the little tab that won't stay down.
2. People who don't signal a turn.
3. People who stand at my cash and act surprised when I tell them they owe me money for the things they want. News flash - stuff in a store isn't free. Get your wallet out, get out your damn debit card, and hand it to me when it's your turn.
4. People who park right next to me in an otherwise completely empty parking lot.5. The pizza from Pizza Pizza - not enough cheese.