I've experienced the pepper-in-eyes thing myself. I experienced pain in my nose, too, from it. Hmm, once, I ran really fast down a hill on this road with sloppy asphalt with small, sharp rocks literally glued to it. Not a nice thing to fall on, and of course, that's what I did, and slid over them about a yard and a half before I stopped. I got my knees, elbows and hip pretty badly fucked up from that, and got big holes in my jeans.

"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram