Where I used to work back in the '70s there were lots of injection moulding machines.
These machines were huge and basically they held two halves of an equally huge mould together
while molten plastic was pushed into it. The hydraulic ram pressed at over 100 tons, but there was
a sliding guard on the front which prevented the mould from closing when it was slid back.
Right, I think we all know where this is going.
At that time there was a labor shortage in the UK. All sorts of eejits got recruited. One night shift
one of said eejits was running one of the machines. The machines were mostly automatic. Mould
closed - plastic shot in - mould opened - moulded item dropped out , went down a chute into a box - repeat.
But occasionally one would 'hang up' and the operator had to slide back the guard and poke it with a stick.
Not this lad. He thought it would be good to reach over the top (not easy to do) and put his hand in.
You can guess the rest although by sheer good luck it wasn't as bad as it might as been.
The machines were in the process of being being modified so that the ram had a sensor which would
open it if it closed with any undue resistance. A bit like the window on a car. This was to protect the mould
if anything, not a safety feature. If someone left a pair of pliers inside then it would be expensive.
As it happened that machine had been modded just the previous day. The lad got a nasty nip but no permanent damage.
So never underestimate the sheer stupidity that some people are capable of. Especially when operating heavy machinery.