Okay, with the usual disclaimer that a pet peeve is not a claim of perfection, mine is the misuse of pronouns in prepositional phrases. For example, it sounds like fingernails on a blackboard when someone says, "I made a reservation for my husband and I" when it should be "for my husband and me". You'd never say "I made a reservation for I" and all you have to do is think of it that way and you know the correct word to use. Like Cathy, I am especially annoyed when a journalist who should know better does this.