Hit the back of his head on the asphalt just so, and after laying brain dead in a hospital for three days, died.
Sad, sad, sad. Because in a few more years, these young adults would have been old enough to know better, but never got the chance.
When I was a teen, I was sitting on the back of a friend's car in a parking lot while talking to other friends. He started it, rev'ed the engine and took off.
I stayed on because I thought he was going to slow down, but he kept going faster and faster until I figured that if I fell off I would be dead.
So, rather than fall off at 40, I jumped off at about 20mph.
The only thing that saved me was my western boots with steel "horseshoe" taps. I slid backward as the taps sparked all over the place and came to a stop facing backwards. I was able to modulate my traction by shifting my weight from front to back to remain stable.
I was really pissed, but alive.
If I had been wearing tennis shoes, probably would have been brain dead too.
The guy driving the truck was never the same either.