Son Goku, being tired and badly injured, almost didn't see the egg that the Demon King Piccolo had hocked up and spat across the countryside. It had been a rapidly diminishing blur in the corner of his eye when he made the decision to follow it. He didn't know why he chose to do so, since he was on the verge of passing out and probably wouldn't reach it before it landed, but follow it he did.
Miraculously, he had managed to catch the egg just before it went barreling down a waterfall. Since it was heavy like there was something inside, he knew he couldn't eat it. He remembered how sad Grandpa Gohan had been when he'd discovered the eggs he'd found for their lunch had had baby birds inside. After carefully bringing it to dry land and gently setting it down, he rather impatiently waited for it to hatch.
Eventually, the egg cracked, and finally it opened enough so that he could see inside.
He gasped. Inside the egg was...
The first thing Piccolo ever saw was his father's enemy.
The first words he heard were:
"You must be a girl, 'cause you don't have a winky. I'll name you Midoriko 'cause you're green."