Hah...he would never do that...being an Old One he saw through your prank and polymorphed the urine into Forever Ale before drinking it.
But I think he just might do the opposite to every tankard of Ale that you drink in this bar if you're not careful
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Melusine, High Queen of Fluffies, Archbabe of the Order of the Holy Flame and the Laughing Hyenas, &
Official Entertainer Elf of the BG2 Bar
Your voice is ambrosia