Fossilized fish scales

Fossils are fascinating. Once when I was young I found a rock with fossilized fish scales all over it. It was really exciting. How old were these scales? What sort of fish made them? Do I get wishes? It really seems that if you find the fossilized remains of something, it should have to give you wishes. Or at least really wise advice. Fossils are basically natures fortune cookie. Anyway, I took the rock over to my teacher and she pointed out that what I had found was actually a discarded sandwich and the "fish scales" were nothing more than bits of mold. I threw the sandwich away because I bet that mold gives horrible advice.