Many of us belong to the Stop At 2 Kids generation. When I was a kid, some idiot told me during sex, one of your testicles get transferred to the woman. That's why most of our parents only have 2 children. No more testicle to make baby. KNN Scary! Lam Pa Ji gets confiscated by the woman in order to make a baby.
So someone asked how come so and so's parents only have 1 child, the answer becomes his daddy still have 1 testicle left whereas our daddies have no more testicles.
And now... children watch Cells At Work.