This is what happens when you get a bicycle tire moveing at high speed with an angle grinder and it flys off to front frok of the bike. Its the red mark in the middle of my arm. Now its about triple the size of what it is in the picture and it hurts!

http://i2.photobucket.com/albums/y34/scob89/P1010310.jpg

http://i2.photobucket.com/albums/y34/scob89/P1010310.jpg
