I was pretty certain I could see the world turning, but it was actually just the clouds moving in the sky. I thought gum splotches on the pavement were tiny meteors. I thought people would become way more mature as they got older. I thought everyone judged me and my actions as if I was an adult (that feeling is still hard to shake - maybe it's true for all I know).
I was also told an awful lot of things about wearing socks to bed, venturing into certain parts of town and so on - all of which made me superstitious, but I didn't necessarily believe them.
I believed in ghosts, fairies, unicorns, all that good stuff - but I still do, just in a more abstract, conceptual sense (except perhaps for ghosts, they seem a bit too real to be as abstract as the rest).
BQ: I don't believe in Santa Claus as an actual guy, obviously. But I do believe in Santa Claus as a spirit or concept, which is essentially undeniable given his presence and influence over so many people's psyches.
Oh! And I just want to mention, because this recently happened: an Aries friend of mine from Korea recently told me that when she was little she thought people with blue eyes saw the world with a blue tint and people with green eyes with a green tint! She thought only brown eyes led to the colour scheme she saw. I thought that was awesome.