Some of my pet peeves have already been mentioned. Some of them are as follows:
1. People who drive in the passing lane as if they own it.
2. People who say theirself or hisself. There are no such words!!!
3. People who constantly criticize others! LOL
4. Children who are left to their own devices in any store.
5. People/children who don't take responsibility for the consequences of their actions.
/btw I love Diet Coke. Regular Coke tastes like syrup, so I always drink Diet whether I am eating a candy bar, a salad, or nothing else at all!