Personally, I remember some things that still come to my mind these days, and I often wonder whether they were just dreams I had when I was a little one, or vestiges in my memory of something that really happened. Their realistic nature is what makes me wonder...
I remember being a drop in a kind of background made of many melt colors, like all the colors of the rainbow twisting togheter and making a sort of pool, not of water but of some denser substance. I also remember another strange background, can't describe it well but the closest I come to, is a sort of coral-sponge surface with some upward drops coming out of it. Something like this
but softer in appearance. These may come from an uncertain time, but I remember thinking about it when I was about 3 or 4. Then with time it became vaguer, but all my life I've been trying to find some pictures that represent what I saw, and I haven't been able to find any. 
I also haven't heard of anybody who's seen something like that, if you have any ideas of what could it be let me know.I also remember when I was about 4, being with my mother in some kind of boutique for children, we were there to check out some clothes for me and there was a huge mirror there. She held me up and down in front of the mirror, kind of like playing with me, and I remember seeing in that mirror a mother and daughter identical to us, but with slightly different clothes, and something strange... everytime she held me up, the mother in the mirror would hold her daughter down, and everytime she held me down, the mother would do the opposite. They were laughing and sort of teasing us in a playful way, and no I don't think it was really our reflection. Since that day I've been thinking about it.
When I was about 9 years old, I heard "Flower Duet" (by Lakme) for the first time. I felt something strange when I heard that song, and it stuck to my memory. Then, some night after, when the power went off for a while, me and my mom were waiting in the living room for it to return. I began thinking about that song, and suddenly I felt very cold, sad and scared. Then I started crying for no reason, feeling as if I had just been persecuted and killed. I felt empty and really sad, which wasn't normal for me at that age.
There is one more. I was walking with my mom by some street, and we walked next to an abandoned old house. She told me to stay away from it, because a witch lived there, and I would be really scared everytime we went near that house. This happened several times while we were walking on that street, and these days I ask her about it and she remembers walking by those streets (since she used to work near) but she claims she never told me anything about a witch living there. (She's not the kind of parent who makes up stories of monsters to scare her kids). Ok, that may be silly, but it still makes me wonder
Now share yours...