It happened at our school too. In junior school there was a whole 'riding school' thing where we brought in riding crops (or if you were a poor kid and didn't have a pony, you used a stick) and jumped over branches propped between trees, hitting ourselves with said implements and pretending to be on horseback. Or perhaps simply preparing ourselves for future bondage sessions. It was run by the most popular girls, and you could only join if you jumped a set course with sufficient style. Let's hear it for all-girl catholic schooling...