I figured that the sperm that made 1/2 of me was the lucky duck - faster than the rest for the most part, really, but while the other speedy sperm found theiir way to the egg and were banging their heads against the wall, the lucky sperm was also very smart and was scouring the surface for a way in. I think it systematically and methodically went over the surface, saying, excuse me, pardon me, pardon me, excuse me, 'til it found a little crack and squeezed its way in. voila! me. "