Funny one.

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A guy goes into a bar and orders a beer. As he takes a sip of his beer, he hears a tiny little voice say: "Nice tie." He looks around but sees no one. He takes another sip of his beer and hears: "A nice shirt, too." Again he looks around and sees no one.
He signals the bartender over, and hesitantly explains that he's hearing voices talking to him... "Of course," smiles the bartender. "It's the peanuts -- they're complimentary."
~