http://i.gizmodo.com/5157354/boy-killed-anally-when-office-chair-explodes Sweet Jesus this would suck.
I think if pieces of metal shot up your ass and the chair fell apart, i doubt you would be in the chair long enough to bleed on it.
Umm did they clean the chair for blood before they took a picture? Maybe it was a clean hit and he bled internally ...
kneel on the lower blue pad, curl your legs underneath the top blue pad. Top blue pad is where you bum goes. Just as if you were doing leg curls/extensions.
I'll have to look for these exploding chairs at Staples. It would be pleasurable if the setting was turned down a bit, a a few vinyl coated parts would prevent injury.