A couple in their late 80's made a trip to the fertility clinic to discuss the possibility of having another child.
After a lengthly discussion with the doctor, and listening to his repeated comments about all of the health risks, they informed him that nothing he could say would change their minds.
The doctor gave in and handed them a small jar and said " you will need to take this home and bring me back a sample and we'll go from there". The couple got very excited and told the doctor they would be back the following morning.

After three days went by and the couple had not yet returned, the doctor decided to make a follow up call to see if they had come to their senses. When the old man answered the phone, he began to explain to the doctor....

" Doc, I just don't understand it, we've tried it with her hands, we've tried it with my hands,
we've tried it with her teeth out, we've tried it with her teeth in,
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and we STILL can't get the lid off that damn jar" =)