Saw it happen, didn't happen to me, though .....
What happened to me was I had an old bike with torsion-bar suspension on the front, and a motorcycle-style seat with shocks on the back - heavy old bike, but pretty fun, too. There was a building about a mile away with a walkway around the outside, maybe three feet up, big enough to drive a car around the building (if someone actually got the bright idea to do so .....). Anyway, a friend bet me I wouldn't take the bikeoff the walkway onto the lawn, so I got up some speed, wheelied right off the edge of the walkway, and hit the lawn about three feet down. Result: taco'd the rear rim, the shocks and torsion bars compressed all the way down, then fired back up - threw my silly ass right over the handlebars! Had to walk the bike home and replace the rear rim (won the bet, though ......)
Ah, the crazy things you do when you're young and invincible .....