Years later, when I was working in corporate entertainment at a 'major race circuit', they were looking for new corporate style activities and were convinced to try a couple involving motorcycles. One of them involved riding a trials bike across a barrel based see-saw. Bike licence holders only was the qualification but strangely most men seemed to have bike licences - or so they said . The idea was you'd ride up the ramp, throttle off until the see sawed and then ride off. I think it was the third or fourth person (and the boss of this particular company) who (inevitably) did exactly the opposite. He got to the balance point, panicked, and opened the throttle. The bike shot off the end about 10ft in the air and landed on top of him. The fuel cap then leaked petrol all over him. Fortunately the feared inferno didn't happen and he only had bruises but that finished, right then, anything to do with motorcycles for at least a decade.