When using an angle grinder that can switch between left-handed and right-handed operation, remember to move the blade guard when you move the handle.
I managed to cut a few things before my thumb, since it was the adjustment of my grip that made me put my thumb down just beside the guard. And even then, I was able to make a few more cuts before applying pressure on the spinning blade using my thumb. It cut me cleanly through the tip of my thumb and my thumbnail.
If you click “more”, you’ll see it. Be warned/excited.
It didn’t hurt, and it didn’t bleed. My friend and I stared at it for a minute or two before deciding to look for a band-aid to keep the dirt out of the wound. Then I went back to grinding.