Jaw Boned

A chemist becomes a meth addict and spends his entire life creating large batches of the drug, living off nothing more than a wad of chewing gum. During his tradition of dipping the gum in citric acid, the addict accidentally coats the gum in red phosphorus, biting into it with enough force to trigger an explosion which blows off his lower jaw. note don't do drugs or that could be YOU