My father had a nasty habit of keeping an eye on the neighborhood. When people went out he would go peek in their windows or let himself in their houses as he knew where the spare keys were. He wasn't a thief, but would snoop through all rooms, closets and drawers, read mail, look at documents and tax returns, open the fridge, etc.. We could never get him to stop or even take it serious. His excuse was always the same, "It's OK. If they have nothing to hide it shouldn't be a problem."