From Japanese Mythology...
In the mountains near Lake Biwa, lived the Centipede, a monstrous, outsized creature that preyed upon the people who lived there.
The Dragon King of Lake Biwa called upon Hidesato, a legendary hero in Japanese myth, to slay the Centipede.
Hidesato killed the creature using an arrow coated with his own saliva, fired into the Centipede's brain.
For this mighty feat, the Dragon King rewarded him with a ricebag that would never run empty.