I almost did that to myself once!
I had a summer labouring job for a few months in the mid-70s at a factory in Coventry which made extruded and moulded plastic products. They had a big machine for chomping up scrap material and I was given the job of chomping up several hundred feet of plastic waste. It was in the form of piping made of a very flexible, rubbery kind of plastic and I was supposed to chuck a few lengths of it into the machine stand back, and switch the machine on, switch it off, add the next lot of scrap, and so on. It was taking too long so I just left the machine running and continuously fed the piping in. Yes, it was an accident waiting to happen ...
I was making good progress and began to feed the stuff in so fast that the machine was struggling to do its chomping. As I turned to grab the next handful of piping, the end of the piece I had just thrown into the machine managed to wrap itself round one of my wrists and I was yanked off my feet and dragged towards the opening of the machine, beyond which were the chomping cutters and rollers!
A real heart-stopping moment ... I was damn lucky in that I had chucked so much stuff into the machine that I jammed it and the motor cut out! My arm was only a foot or so from being pulled inside.
I switched the machine off to load it after that!