Remember kids... always wear a helmet. (The almighty bikeradar helmet thread)

thats cause you tried landing on your chin.
you should have worn it like a beard net rather than a beret

I did think about what would have happened should I have been wearing a full face helmet- however the chap I spoke to whilst I was going in and out of the MRI scanner said that if my jaw had not broken thus absorbing the force it was a distinct possibility that I would have fractured my cervical vertebrae, or the back of my skull where the tendons attach.