A young man visited a Chinese medicine man. The old man told him that his stock in trade was very small, but nothing he sold could be described as ordinary. "Here for example," he told the young man, "is a liquid as colorless as water, almost tasteless, quite imperceptible in coffee, milk or wine, or any other beverage. It is also quite imperceptible to any known autopsy. The price was five thousand dollars. The young man said he was interested in a love potion. The medicine man had love potions, too, they were cheap - later in life his customers would come back and buy a phial of his five thousand dollar mixture, though.