Murphy walks into the chemist and says "I have 3 girls coming over tonight I need something to keep me horny and potent."
The pharmacist gives him a small box marked "Viagra extra strength".
Next day Murphy limps back. His manhood is black and blue, skin hanging off. "Give me some deep heat" he moans.
"Jesus, Murphy you can't put deep heat on that."
"No" replies Murphy, "It's for me arm, the girls never showed up!"