I don't mean your favorite memory (there could be too many of those to count!), but your earliest memory of your horse life.
Mine was back when I was about 3 or 4 (and I'm 25 now), and it's my earliest memory in general. My grandfather was holding me and we were petting my mom's Quarter Horse over the fence (I can still see what his head looked like, and the barn further on... it's a very vivid memory). My grandpa was rubbing Oto's face, and I thought he was being too rough. I said "Grandpa, they like it when you pet them softly." and I lightly ran my hand down his face a few times. My grandpa laughed and said "He can't even feel that. They like it when you pet them rough."
It's such a vivid memory, and a special moment between me and my grandfather. I don't ever want to forget it... though I think after holding onto it for 20 years I won't be forgetting it any time soon.
What's your earliest memory? It doesn't have to be as detailed... I just remembered a lot from this one.