Grinder disc lodged in safety glasses - GIF

[jdurand]

My wife and I were both taught when young:

Do not stand in line with any grinding or wire wheel when spinning up;

Do not grind on th sides that aren't designed for it;

Never stand in front of high pressure gauges when turning on (like welding).

With all that and guards on machines, she still lost a finger tip at work but they were able to reconstruct it fairly well.