As in: "Well, you deserved it!"?
One time when I was doing some training, at the end of the dive when we began the debriefing the course director called me over, and asked if I would do him a favor: he pointed to a spot just below his left knee, an asked me to please kick him gently, in that exact spot. I looked at him as if he was joking, but he said he really need this kick, so I relented, and gently kicked him.
He turned to us all and said, "There, now there is not one square inch of my body that someone did not kick on that dive!" While he wounded our feelings, and we all knew he was kidding, his point had been made with humor, and the next time we were all in the water everyone was a lot more aware of their fins, and other divers.