Thanks to "TD" for this one...
An elderly Irish woman of advanced age visited her doctor to ask his advice on reviving her husband's lagging libido.
'What about trying Viagra?" asked the doctor.
"Not a chance," she said... "He won't even take an aspirin."
"Not a problem," replied the doctor. "Give him an "Irish Viagra."
"What's this Irish Viagra?" she asked.
"You drop the Viagra tablet into his coffee. He won't even taste it. Give it a try and call me in a week to let me know how things went."
A week later she called the doctor, who asked her about the results.
"Oh, faith, bejaysus and begorrah!" she exclaimed. "T'was horrid! Just terrible, doctor!"
"Really? What happened?" asked the doctor.
"Well, I did as you advised and slipped it in his coffee and the effect was immediate.
He jumped straight up, with a twinkle in his eye! With one swoop of his arm, he sent cups and tablecloth flying, then ripped me clothes to tatters and took me then and there on the tabletop! T'was a nightmare, I tell you, an absolute nightmare!"
"Why so terrible?" asked the doctor, "Do you mean it wasn't good?"
"It was the best I've had in 25 years! But sure as I'm sittin' here, I'll never be able to show me face in Starbucks again!"