Back in the late eighties I was incorrectly using an old B/D stout 10” angle grinder as a cutting tool on some 3/8” thick angle iron and leaning down hard on it and it gripped and kicked back so hard ( even with both my hands on each handle and my arms bowed up ) that it hit me in the forehead just above my eyebrow damn near knocking me out.
Thank God it was the motor casing that made contact with me and not the blade ( also there was no safety shroud ) - even though I had on those large semi-soft rubber/plastic goggles that somewhat softened the blow I ended up with an enormous bump/lump deep cut and apparently was saying sentences backwards word for word when the guys around me were checking me out.
I learned a great lesson that day about not only being extra cautious while using any type of powered tool, along with all safety attachments, but also the dangers of improperly using tools - also, the truly best thing I learned that day was to thank the good Lord for watching over my young inexperienced dumbass !
I took that experience and applied respect and caution to any tooling and equipment from that point on and as a heavy equipment instructor later on in life I made certain to share and show some graphic safety videos in each class to give every student a sense of reality of what could happen so their attitude towards safety equipment & practices was welcomed instead of just being thought of as a hassle.