I've a couple of things that irritate me.
Firstly, drivers who beep their horns to let someone know they are waiting outside their house for them. There's a taxi driver that picks someone up close to where I live who does it just because he's too lazy to get out of his car and ring the door bell. It happened one Saturday morning about 8 a.m. when I was having my lie-in and woke me up - I wasn't very happy
Secondly, cars that park on pavements. This really bugs me. Pavements are for pedestrians!!
.......and relax! I feel better now that I've got that off my chest