That's one of your worse fears? I once rolled off a curb on a bike whose front skewer was loose.

That sucked. Fork into pavement, hands and face soon to follow.

I'm pretty sure that will never happen to me again.

I've seen a bar failure in a MTB race, that was pretty nasty. I'm going to pray that never happens to me.

Seems like a crank failure would be pretty tame...