Not wearing helmets is definitely a Darwin Award. But the OneWheel itself has a tendency to just shut off and nose dive when limits are exceeded. Usually at max speed. Even though it’s programmed and designed to be self righting it can sometimes not act correctly and just fling you off. So you could be cruising along just like you always do and when you start leaning too hard it will slowly nose back up and slow you down to keep you within the limits. But let’s say that’s happening for the 80th time and you happen upon a small rock at the same time only for the software to be unable to correct and nose dive into the ground instead. To the rider nothing would be different until the unit nose dived throwing them usually at full speed.