The Hand of …..

As I was walking to the newsagents early the morning to pick up a paper, I noticed a hand print on the frosted rear side window of one of the cars parked in the street. We had had a particularly heavy frost but how this came about I can only speculate. Had somebody leant on the car with their hand during the freezing process ? Or perhaps it was something more sinister - someone desperately trying to get out of the back of a locked car ! On closer inspection it was definitely a hand print but I did not let my imagination and curiosity get the better of me and left well alone. Any Guesses ?