Some of the worst injuries I have seen have come from chainsaws. It'll mash up an extremity like hamburger. I also know a man that took one to the gut and has never been the same since, he did survive at least.
A guy was having trouble with his saw, so he idled it up to keep it running.
He sat the saw down with the chain still moving, then picked up a chunk of wood and stepped sideways into the saw.
It ran through his leg, and then stalled out.
His young boys got him in the back of his pickup and drove to hospital ER.
The one boy ran in for help and as the doctors and nurses came out, they looked at the poor guy and passed out.
They finally got a heart surgeon to get a rib-spreader to get the saw out of his leg.
Kind of important to keep your saws running good?