Olga Kowalski goes to the doctor in desperation. "You have got to help me, doctor!" she cries. "I have got twelve children and I just can't stand the thought of looking after any more of the little monsters. What can I do?"
"Well," says the doctor, "have you tried contraceptives?"
"I can't do that," says Olga. "My husband is a strict Catholic. But if I have any more kids to look after, I will go nuts!"
"Okay," says the doctor. "I have been experimenting with a new method. It is not one hundred percent safe, but you can try it if you like."
"Anything," cries Olga. "I will do anything!"
So the doctor takes out Olga's womb and implants a monkey's womb.
The operation is a success and the doctor tells Olga to come back for a check-up in a few months.
When Olga comes back, the doctor asks, "How is everything going?"
"Just great," Olga replies. "They come out, hop onto a tree, and off they go!