Thompson K231.6.2.2 — Trickster fills his gallon jug half full of water, then has it filled with rum at the store

Trickster fills his gallon jug half full of water, then has it filled with rum at the store. When seller refuses credit, he pours back half gallon of the liquid—now half rum and half water. Sometimes trickster repeats operation, getting richer mixture with each transaction. U.S.: *Baughman.