Liver
If the moon is dry, it's good for your liver! Haha, get it? Because there's no moonshine to ruin your liver. Don't drink, kids.
Imagine holding an empty bottle up to the moon and seeing it's completely dry. You pat your belly above where your liver is and say, "I guess you're safe tonight, liver."
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As you pat your liver suddenly a strange feeling bubbles up and the ghost of Genghis Khan (かん) comes out! Right out of your liver.
Genghis Khan glares down at you, "You inherited my liver, and that means no moonshine for you. Protect your liver and don't drink, like me, Genghis Khan."