I have so many pet peeves but icant list all of them here. Here's a few of mine:

-people walking slowly in front of you when you are in a BIG rush
-when girls don't move to the side a bit to let you see yourself in the mirror in washrooms
-when people talk non-stop when you are trying to focus on your studies in a library
-when girls are trying to get attention by showing their stomachs or bras (none of my business, but it irritates me)
-when people in front of you in a class keeps texting non-stop on their cellphones when you're trying to pay attention to teachers/instructors

What about you?