Everyone has one (or more) pet peeves, right?!
Mine are people who park in what we call "second row". You might know that parking spots in Germany are sometimes hard to find (even in residential areas) and there are plenty of people who park in the street on the side, parallel to people who are parked properly on the sidewalk. Often enough they park in such a way that the other car is blocked and cannot get out or only by going back and forth like a hundred times and squeezing themselves out of their spot. I cannot count the times I have been blocked like that.
Sometimes I leave a "thank you" note on their windshield
What is your pet peeve?