fock, now I'm light headed...
I had a similar incident...took a clamped on lid off a tank at work...removed the clamp, standing to the side of the sightglass into the tank, then felt no pressure while removing the glass...it was stuck to the gasket and the gasket to the tank...I pulled on it releasing the bond that it had made, and the glass hit me in the same spot under the chin, I swear the back of my head hit the middle of my back when it happened...I was stunned, and looked down at my shirt to see the blood starting to pour out of me, thought I got an artery or something, close but not quite...it peeled back my skin and underlying tissue and whatever else is in there pretty good...3 layers of stitches; 4 in deep, 6 into a layer of skin, and 8 more to close it up....felt like I was in a heavyweight fight with Tyson.