Utterly Mad

A man in his 60's married a woman in her 20's, and was trying for a baby. For months, there was no result, so the man went to his doctor for a sperm count. The doctor said, "Fill up this specimen jar up, and bring it to me tomorrow." And so the man leaves.
The next day, the man comes back with an empty jar and says to the doctor, "It didn't work."
"What didn't work?" The doctor said.
"Well,I was trying it with my right hand, but it didn't work, and so I tried it with my left hand. It still didn't work. So my wife tried with her right hand and it didn't work, her left hand, it didn't work. She even tried with her mouth, and it still didn't work. When her friend came over, she tried with both her hands, even her mouth,and it didn't work."
The doctor is dazed. "Your...wife's....friend?!"
"Yup.We couldn't get the lid off."