I'm used to motor cyclists wearing leathers. Bare skin in an accident looks terrifyingly abrasive.
Nobody's ever managed to make it more that a second.
http://i.imgur.com/gRqg50J.png
at about 22mph. ;)
That's pretty much what happened to me. I was going walking speed on a bike, popped a wheelie, handle bars came off, I tumbled forward and landed collar bone first onto a curb. Hairline fracture at about age 14.
I pulled the brake lever on my road bike once, and it FELL OFF. Went right into the front spokes and launched me over the handlebars like a cannonball. It was like putting a metal rod right into the front spokes.
That sounds very concerning. I didn't know that could even happen...
I don't know too much about bikes, but the one I had used some type of bolt to connect the handlebars to the main frame.
I was adjusting the height of the handlebars and I guess I didn't tighten it enough in the end. User error in all its glory.
It is all about the angular momentum of the cyclist wrt to the road.