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A person who buys you a drink just to make you look like a fool by insulting you, slapping you, and telling a joke so bad it makes your brain hurt.
I paid for this drink so I could call you a moron and slap you. Enjoy your life.
You thought you were getting free alcohol? Nah, you're getting free humiliation.
I bought you a drink so I could say your joke was worse than my ex's singing.