I used to drive home from my girlfriend's house late at night and stop on a stretch of road to take a leak. I'd walk backwards while peeing, creating a crooked line of pee in the road. I'd add to it night after night, then I'd drive by in the day to see my long pee stain in the road only I knew about. Anyone who passed by could see it, but only I knew what it was. It would last until the next rain and I'd have to start over.