Honestly I have numerous pet peeves. One of my biggest pet peeve is when people chew with their mouths open. It is almost like nail on a chalk board to me. Just the sound of the food smacking between their teeth makes me cringe. Most of the time the person I get the most annoyed with is my sister. She is twelve years old and should know that it is rude to chew with your mouth open. Whenever she does this, I can't help but just stare at her when she does it. I really try to control it when it is someone I do not know.