The people who drive all the way up to the front and cut in when you have to merge lanes.
In my hometown, there was one bridge to cross the Missouri river. One summer, they were doing some construction and traffic was a mess. I worked on the other side of the river and had to sit through miles of traffic every afternoon. The people that would zoom by, expecting to be let in annoyed me to no end.
One afternoon, the truck in front of me pulled out as if he was going to try to pass everyone. However, he just stayed right where he would have been in the other lane. The irate impatient people lined up behind him but he wouldn't move. When we got to the one lane, I let him (and only him) back into my lane. I still smile when I think about it almost 20 years later.
My main pet peeve is when people say nuc-u-lur. I'm in nuclear medicine so i get to hear it a LOT. My boss even says it

