Once there was a sperm named Šuki. When all the other sperm were just swimming around, Šuki was doing sprints and lifting weights. 

One day, the other sperm gathered around and asked him, "Why don't you just swim around like us?"

Šuki replied with a smirk, "Well, When the time comes, I'm going to be the first one there."

The others told him it was just destiny, but he said it wasn't. It was, according to Šuki, survival of the fittest.

So the day finally came when they were called upon. They were swimming along with Šuki pulling way ahead of the rest. Suddenly he stopped, turned around and headed back.

"What's up, Šuki?" the others asked.

To which Šuki replied, "False alarm. Back up, boys, it's a blow job!"