In college, after Dad sold his garage, I had a part time job in a custom door & window shop. One day the supervisor walked up to me and said, "I got a new machine for you to run. Follow me."
We walk over to a jointer, 'bout an 8 inch model, IIRC.
"You know Jesse, the warehouse foreman?"
Me: "yes"
"Notice he's missing two fingers?"
"uhhh, yessss?"
"this is where he lost them!"
So I got a lesson in using a pusher block, so if the blade grabbed the workpiece, my fingers wouldn't fall into the blade.
Never have had an urge to buy a jointer...