What is habit in you that you cannot stop

i dont know what's with this habit but i sometimes it's weird of me to read plate numbers of series of cars on the road. sometimes with no purpose, i just mentally keep plate numbers in my head and recall them later on if i happen to bump with them somewhere. i sometimes get tired of doing it because im getting nothing but really while im on the road, i can't stop my eyes looking at plate nmbers instead of some things around.

Not that I am aware of, but I am sure that I have a bad habit somehow. I guess, I will have to think more about that.