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Speaking of painful things, fire-walking is the practice of walking across a bed of hot embers that is often used as a rite of passage in many different cultures. Walking on broken glass however is purely for entertainment and this is possible with a few adjustments such as using wine or champagne glass which tends to have a softer edge, placing lots of glass on a spongier floor and also walking across slowly and repositioning your feet if you feel any sharp edges. With larger piles of glass the small bits tend to drop to the bottom of the pile meaning you don't get the same sting you would if you were to step on a bit of glass in the street!