After a few years of married life, a man finds that he's unable to perform. He goes to his doctor and the doctor tries a few things but nothing works. Finally the doctor says to him, "This is all in your mind" and refers him to a psychiatrist.
After a few visits to the shrink, he confesses, "I'm at a loss as to how you could possibly be cured." Finally the psychiatrist refers him to a witchdoctor.
The witchdoctor says, "I can cure this." He throws some powder on a flame and there's a flash with billowing blue smoke. The witchdoctor says, "This is powerful healing, but you can only use it once a year! All you have to do is say '123' and it shall rise for as long as you wish!"
The guy then asks the witchdoctor "What happens when it's over?"
The witchdoctor says, "All you or your partner has to say is '123' and it'll go down. But be warned, it won't work again for a year!"
The guy goes home and that night he's ready to surprise his wife with the good news. So, he's lying in bed with her and says "123," and suddenly he gets an erection.
His wife turns over and says, "What did you say '123' for?"