Personally I cant see why sucking a hammer would do any good. It must be based on sympathetic magic like curing a sword wound by treatin the swordgold said:. . . Heres one... when you hit your thumb with a hammer, put it straight in your mouth to remove the pain :eek!!!!:
I had whooping cough when I was very young (before they thought of a vacine for it) and I was taken to where they were doing road works. The smell of the molten asphalt was supposed to be a sovereign cure. It actually made sense The various acids in the smoke are antiseptic.