Regular Strange Games reader Duncan Flann has been in touch following my recent post on Spike Ball. He uses a small trampette and a tennis ball to play a similar-ish game, but one that involves pain... he calls it Groin Ball.Duncan writes, "Hello Monty...I've just got to tell you about my game Groin Ball. It's for two players. Each stands opposite each other close to a small round trampette.