A man walks into a watch and clock store, unzips his trousers and slaps his cock on the counter. The woman behind the counter doesn't bat an eyelid. She looks him straight in the eye and says "Put that away Sir, this is a clock shop - not a cock shop!" "Well," replies the man, "Why don't you put two hands and a face on it?"

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There's someone in my head, but it's not not me - Pink Floyd