OK OK. Here goes....

A newly born sperm was receiving instructions in conception from the instructor, "As soon as you hear the siren, run for the tunnel and swim in
a straight line until you get to the entrance of a damp cavern. At the end of the cavern you will find a red, sticky ball which is the egg. Address it and say, 'I'm a Sperm.' She will answer, 'I'm the Egg.' From that moment on you will work together to create the embryo. Do you understand?"

The sperm nodded affirmatively. The instructor impressed upon the sperm that he had to swim hard and reach the egg first,otherwise it would all be
pointless. "You really have to swim for it!" Two days later, the sperm is taking a nap when he hears the siren. He wakes up immediately and runs to the tunnel. A multitude of sperm swim behind him. He knows he has to arrive first. When he nears the entrance to the cavern, he looks back and sees that he is far ahead of the other sperm but he still swims his heart out, tail fin aching, just to reach the egg first. At last he approaches the red, sticky ball, still way ahead of all the other sperm. When, at last, he reaches the red, sticky ball, he smiles and says, "Hi,I'm a sperm." The red sticky ball smiles and says, "Hi,I'm a tonsil."