When I was little i heard about the shiny pokemon, but didn't understand what they were, actually. So, i saw a normal ratata in the first route in pokemon fire red, and thought it was shiny. I captured it with my masterball! (i was training my larvitar, after the pkm league)
And my friend convinced that he had a pikachu in his house in childrengarden. I believed it, and I reply that I had a charmander in my house (it wasn't real, it was a lie). Then, he was surprised, and since we thought they were real, each day we met we were saying things like "my charmander evolved" or "my raichu is better than your charizard" until the end of the year. I had fun, now it's so embarrasing.