A seventy-five-year old year old man went to his doctor to get a sperm count.
The doctor gave the man a jar and said, "Take this jar home and bring me back a semen sample tomorrow."
The next day the seventy-five-year old man reappeared at the doctor's office and gave him the jar, which was as clean and empty as he had received it on the previous day.
"Where's the sample?" said the Doctor.
"Well, doctor, it's like this," the man explained. "First I tried with my right hand, but that didn't work. Then I tried with my left hand, but still nothing. Then I asked my wife for help. She tried with her right hand, then her left, still no joy. She even tried with her mouth, first with the teeth in, then with her teeth out, and still nothing."
"I see.." said the Doctor dubiously. "Then what did you do?"
"Well, I asked my sixteen year old neice to lend a hand, but she failed too, even when she took it between her legs and squeezed it really hard."
"Her legs!" exclained the doctor, appalled.
"So I went next door to Eileen, and she tried too, first with both hands, then both armpits in turn and she even tried rolling it between her knees, but still nothing.
"You asked your neighbour?" cried the shocked doctor.
"The old man replied, "Yes, but no matter what we tried we still couldn't get the happy fellowing jar open!"