Nerf gun roulette
OK, so we need to get past the sinister angle of the play on Russian Roulette and just take this as a bit of fun that will help us to think about and explore the different conditions that can affect probability. In the first instance, this game is really easy to describe. You have a six barrel (nerf) shotgun (link as an example). There is one bullet in the barrel, spin it, line the teacher up against whiteboard and...