I don't know whether this is real or not but I fully approve !
A few years ago I was waiting at the lights on my bicycle and some loutish chap threw his fish and chips out the window, onto my lap. I quickly picked it up and emptied back into the window, making sure that the contents were as evenly spread through the car as possible. There was the usual foul mouthed response but I had already taken off and the lights had changed, which left the driver with nothing to do but wave his cigarette at me, still using the foul language. I suppose he must have been smoking and eating at the same time !
Very satisfactory. Wished I had had a motorbike though !