You have a cycling buddy called Frank. His wife refers to him as "Frank the scab" as he spends his days monitoring local hard rubbish put out for collection so he can sell it on gumtree. When he goes to the local service station, he prepares his one dollar cappuccino but presses the double shot button so he gets two hits of coffee but only paying for one. You're an ethical person. Should you ignore the behaviour or report him?