I’ve never managed to cut anything with my angle grinder (mine’s a 4 1/2”) that I didn’t intend to cut, but I did manage to drill into my left thumb once.
I was cutting a metal tube and the wheel fragmented. Grinder kicked back hard and went half-way through my left index finger into the bone.
Through a leather welding glove.
Nothing a little duct tape couldn’t cure ;)
Seriously though, and I’m sure you are well aware, they are far more destructive than any knife ever invented.. Better ban them.