A friend sent this to me. They got it correct in one place, but not in another on the same sign. Perhaps they were out of the letter “e” or perhaps they just weren’t paying attention. In this sign, both should be “you’re,” the contraction for “you are.”
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The typo could also be the word “whispering” as the sentence would make sense as “Alcohol consumption will make you believe your whisperings.”
You are correct that it could be whisperings, but based on the ridiculous number of uses of “your” instead of “you’re” that I see daily, I’m sticking with that as the error.