I work at a gas station with a propane attendant. I had a man come in asking to fill his propane tank, but it was out of date by over twelve years. He offered to tip me twenty bucks, but I refused. Finally, he got so angry that he peeled out of the parking lot and threw the tank out his window, attempting to hit the window of the gas station, but it only made it to the curb. Strange angry old propane men are strange.