Guy goes to the doctor to get some viagra... Doctor: "No, last time I gave you some you threw your back out" Patient: "Doc, you dont understand. I got two girls coming over tonight." Doctor: "All right, but you better not come in tomorrow complaining about your back" The guy comes back into the doctor's office the next day. Doctor: "See I knew you'd throw your back out" Patient: "No doc, my back's fine. The girls never showed up, but I threw my shoulder out"
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