and don't it feel good!
Actually, it's David G. Willey who is walking on broken glass, as the accompanying picture shows.
Willey has also dipped his hand in molten lead; picked up a piece of orange-hot space shuttle tile; and performed the person on a bed of nails smashed brick trick.
The story is from a 1999 back issue of Skeptical Inquirer, and is titled The Physics Behind Four Amazing Demonstrations.
Link.
