The resilience of the human alimentary canal is evidenced by our ability to swallow liquids that are so potent they’re capable of bursting into flames. Brandy for example, will catch fire almost as easily as kerosene. In the late sixteenth century, this property was incorporated into a drinking game called flap-dragon: raisins were dropped into a glass of brandy, the liquor was lit, and participants then took turns slurping the flaming raisins into their mouths.