I have several. Now I don't mind typos, or a misplaced comma or those things, but one thing makes me cringe more than any other. I thought it would be fun for us to share ours, but we need to stay on topic for this section. To do that, let's make this a learning exercise. Name your pet peeve, why it bugs you, and the rule for proper usage. Of all my pet peeves, the one that gets me most is when people say things like "John went to the movie with Paula and I". or "This is a picture of Paula and I." It bugs me because it is a pretentious, half-assed, effort to sound smart by using the pronoun "I" in place of "me"...and it is incorrect. This is a mistake made mostly by otherwise intelligent people trying to sound smart without actually learning the rule. To select a pronoun properly, remove the other party. Would you say "John went to the movie with I", or "John went to the movie with me"? Of course you would choose the latter, and that is the one you should use next time Paula goes with you and John. Now, what's yours?