This guy walks into a pharmacy and says to the pharmacist, "Listen, I have three girls coming over tonight. I've never had three girls at once, and I need something to keep me horny...keep me potent."
The pharmacist reaches under the counter, unlocks the bottom drawer and takes out a small cardboard box marked with an "X" and says, "Here, if you eat this, you'll go NUTS for 12 hours!"
The guy says, "Gimme 3 boxes."
The next day, the same guy walks into the same pharmacy, right up to the same pharmacist and pulls down his pants. The pharmacist looks in horror as he notices the man's penis is black and blue, and the skin is hanging off in some places.
The man says, "Gimme a bottle of BenGay."
The pharmacist replies, "BENGAY?!?!?! You're not going to put BenGay on that are you?"
The guy says, "No, it's for my arms, the girls didn't show up!"