On the topic of pain-based games, I once witnessed a group of teenagers engage in what seemed to a 10 y.o me an extremely brutal example. The contest consisted of two players, sitting across from each other over relatively long, smooth table. After coinflip to decide the first player, each would take turns flicking the coin across the table, with the goal of making the coin over the opposite edge. The defending player would attempt to block this using their knuckles, which were required to be pressed down against the table with their fingers curled back towards them for the duration of the opponents turn.
The winning strategy seemed to revolve around being able to launch a coin fast enough to significantly bloody your opponents knuckles, and then take advantage of their flinch response to rack up points, all while grin-and-bearing the opponents attempts to do the same. By the end of the evening, the table was smeared with blood on both edges, and the nickel they were using was so caked with the same that it was difficult to differentiate between heads and tails.
The winning strategy seemed to revolve around being able to launch a coin fast enough to significantly bloody your opponents knuckles, and then take advantage of their flinch response to rack up points, all while grin-and-bearing the opponents attempts to do the same. By the end of the evening, the table was smeared with blood on both edges, and the nickel they were using was so caked with the same that it was difficult to differentiate between heads and tails.