Years ago I delivered pizzas. I was at a house that proved the pizza driver saying "The longer the driveway, the shorter the tip." (That saying is often accurate, but not an absolute) It was cold and blowing snow and this guy was waiting for his $0.13 change. My fingers were getting stiff with the cold, so I gave him a quarter and told him to keep it.
The sad thing is that this unconscious idiot is probably still bragging about the time the pizza driver tipped him.
One would think that this sort of thing would bring about some sort of informal system of prioritizing deliveries on future orders.
It just goes to reaffirm my longtime guideline, "never screw with the people who bring you food"...