Why the heck is my baby chcik so sweet?

Wow, my chick is sooo sweet! And it's only three days old!
It thrives on attention. Everywhere I go, it follows me. If I lay on the floor, it runs to me and nuzzles my face. If I call it from across the room it comes running with it's wings flapping, and jumps on top of me. It cries when I leave it alone, or even with his "brooder mates", and falls asleep the second I hold it.
Even now as I'm typing, it can't keep itself from walking on the keyboard and pecking at the keys.

What the heck did I do to make such a sweet chicken? Is it just a fluke, or genetics, or what?