Many years ago, far far away, in another life:
I personally Witnessed, in Miami, a forklift come off a dock backwards.
Seeing people come up on the dock, too far away to really see what had happened, I get out of the truck and walk over.
The forklift had hit on it's counterweight, and rolled over onto the operator, folding his body over and crushing his head, where the headache rack wasn't attached.