As a young lad doing my paper round on a cold, dark winters morning my front light attached to my front fork decided to swing into my front wheel. This had the effect of stopping the bike dead in the road and ejecting me over the front wheel. I hit the tarmac with my head and then my hefty sack of newspapers then hit the back of my head for a double whammy. It also buckled the front wheel beyond repair. It gave me a lifelong aversion to sticking anything on to my bike that could work free and swing into the spokes.
Years later cycling round Derwent Reservoir I came round a bend to see a bloke lying in the road who had done a similar over the handlebars ejection from his bike. His worried two young sons were beside him, obviously upset that their dad was in some pain and distress. He wasn't wearing a helmet and the cause of his accident was poor bike maintenance as his front brakes had become loose and swung into his spokes.