What are your pet peeves?

I don't know if there is already a forum like this, but I couldn't find one. 

Just tell me what irritates you and gets on your nerves the most?

Some of mine: when people are driving in front of me, not trying to turn or anything and they have there blinkers on. 

when my cat jumps up on my desk and sits right in front of the computer screen.

when someone heats something up in the microwave and they don't push cancel on the timer so it just blinks.

Oh yeah and another one is when someone posts faster than me :]