Pet peeves, things that piss you off, whatever.
One thing that happened to me today when I was biking which has happened before; I was approaching a curb and there was a car coming from the other road. I stopped and waited for them to pull out, completely stopped, head down, taking a breather waiting for them to pull out. I look up and they're gesturing me across. Now I have to put my feet back up on the petals, shift into gear and peel out as fast a possible, negating the purpose of stopping and making myself more tired, and feeling like an starfish to boot.