When I was around 14-15 there were a couple of deaths of 17/18-year-olds in the local area in motorbike accidents. None went to our school but that year, it was decided we'd have to have assemblies throughout the year where a police officer would come in and show us horrifying videos of what happens if you fall off a motorbike and aren't wearing a helmet or protective leather / Kevlar. Well it worked, I've never dared get on a motorbike