well, I never thought I liked kids either, but my god-daughter is a bundle of sunshine. When she smiles, all my unhappiness evaporates instantaneously.
I remember recently as well, I'd got really pissed at a club, gone round to see a mate afterwards cos I was having a bad one. And I woke, the next morning, feeling like my head had been shut in a door repeatedly, to her kissing me on my closed eyes. Once again, all the despair vanished...when I saw her smiling at me and saying "Hello Adam!".