He really didn't seem all that special when I bought him from a young boy wandering in Stormwind. Sure, he was cute; sure, he was somewhat rare. But my White Kitten was just one pet among the hundred I needed for an achievement. I bought him and left him in the ghetto of my random pet macro.
Then came heroic Anub'Arak. On a whim, I summoned a pet for luck. That run, it finally clicked; everyone drove their spikes to proper ice patches, and the healers kept most of us alive, even if the main tank died a few seconds before the end. And when I looked down, there he was, purring proudly at me.
Since then, my White Kitten hasn't left my side. He's been there for Argent Tournament Tribute runs. He was with me when we killed Arthas. He was there when we completed our achievements for the Icecrown drake. He even was along when we went back and killed Yogg-Saron to get our raid leader his long-overdue mace. And although our progression has stalled a little in Cataclysm, you can bet he's dodging skeletons, swimming in lava, and cheering us on as we attempt to kill Nefarian.
Who's your lucky pet?