.....given that some level of common sense is required?
At the entrance to a very busy car park at our local hospital this morning. Was -2 without the wind chill, the odd spots of rain were freezing straight onto my windscreen without the blowers on, thats how cold it was.
Some complete DICKHEAD decided that it was as good idea to pour his half finished bottle of water out of his window, onto the road. Right where people need to make a tight turning into the car park. It was freezing as I watched it. I yelled out of my window something calm and considered along the lines of "Its freezing on the road you fucking twat!" to get a "So?! FUCK OFF" back 
I reported him to information, mainly so they could grit the ice, but FFS, what the hell is wrong with some people?!
Oh and yes, he was driving a BMW.