I hate being interrupted! It drives me coo coo bananas. And like SaylorKennedy said, the people who date for a week and are obnoxiously affectionate then they break up and it's like the world has ended. Especially these young 13-14-15 year old couples. Also when you ask someone a question and they don't respond. You say it like 5 times and they look at you like "What?" (cough cough, my boyfriend lol)
I have a bunch of pet peeves.