In olden times (yes, this is anectodal), the process of producing nitroglycerin would be supervised by a person sitting on a one-legged chair, so that he would

In olden times (yes, this is anectodal), the process of producing nitroglycerin would be supervised by a person sitting on a one-legged chair, so that he would not fall asleep. Source: http://bit.ly/hO5N1s http://bit.ly/hO5N1s (translated from Swedish)