Ok - everyone's got at least one. Here are a couple of mine. Nothing skating related please.
When the hot water [at a seminar/conference/buffet] for tea tastes like stale coffee because they don't keep separate thermoses for coffee and hot water. Blech! Tea drinkers unite and start complaining.
When a group of people stand in front of a doorway to chat; thus, preventing the rest of us from exiting or entering said doorway. What makes it worse is when they give you a nasty look when you loudly say 'Excuse Me' after standing there without being noticed. Same goes for people who stop and stand at the end of the escalator and get annoyed when you practically step on them.
A group of people who walk down the middle of a parking lot aisle and not paying attention to cars. Please move to the side and let the car drive past you - the aisle is not a sidewalk.
Drivers who won't move to the left lane when they are not getting off of the highway and there's no one in the left lane and there is a line of cars trying to get onto the highway.