I inherited a very grunty table saw from my father in law. The lights dim when its started, and it takes two men to move it.

It frankly terrifies me somewhat. I have always been very respectful of it, and had had no incidents in a couple of years of use.

However one day he watched me using it and said I needed to use a pusher stick to push the piece in, rather than the tips of my fingers as I was doing.

I switched to the pusher stick, and things felt...safer! I felt more casual I guess. And then, some months later, I contacted the blade with the pusher stick which disintegrated, with a piece flying past my face.

My learning was that sometimes having safety equipment can make one less careful, with a commensurate increase in the likelihood of an accident.

(A secondary learning was that table saws are just plain dangerous, and I wouldn't want a job that involved using one all day long - statistics would catch up with me one day).