I've told this before, maybe here, for sure at the old place.
When I worked for the NPS we had Vermeer's biggest end-load chipper, 20" if I remember correctly. Next size up was top load.
We had a bunch of new seasonal employees for the summer, and the chipper was new, so we got Vermeer to send a rep down and spend most of a day teaching us how to operate and maintain the thing.
Vermeer guy told us about an employee that had been having a rough time post divorce, decided he had enough, emptied his pockets, fired up a chipper, and jumped in one feet first.
He was done before anyone could do anything to stop it.
We put a watermelon through our Vermeer, that was neat. Had one of the seasonal morons put a box turtle through it. Boss was an idiot for not firing him, he got a talking to and a warning. I'd have sent his ass packing.
It had a safety shutoff bar, we took turns manning the safety bar, someone always had a hand on it.