A 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 a label "Viagra Extra Strength" and said, "Here, if you eat this, you'll go nuts for twelve hours."
The guy says, "Gimme three boxes."
The next day the guy walks into the same pharmacy, goes up to the 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 Ben Gay."
The pharmacist replies, "Ben Gay? You're not going to put Ben Gay on that are you?"
The man says, "No, it's for my arms - the girls didn't show up."