Gears.
Ya know what really grinds my gears???
The fastest setting on windshield wipers. I think it's too fast to use without me worrying that they are going to fly off, or even go unnoticed. I mean, if I am too busy seeing the wiper out of the corner of my eye, then I am not focusing on the lines in the road. Even driving around last night, I have not needed to use the fastest setting, and people who use it even when it isn't really raining bother me.
Back to you.