When I was about 5, I thought my parents were secretly somebody else and shared "alien" secrets behind my back. I got over this wierd phase very soon. But for some reason still wondered a little while after.
A childhood belief about aliens

others believed things like this
- I thought the ball-headed person in the Bic logo was an alien and communicated using alien-like noises.Anon
- I used to believe your belly button was a knot that held you together - my parents had wierd anatomical views— anne
- When I was younger, I used to think my dog was a spy and he tolded all my secrets to my mom.— Lilas
- I used to believe that when the moon phase was a Crescent that it was god's fingernail clippingAnon
- Oh oh, I'm an alien, I'm a little alien...
Legal maybe?— Marina - My friend thought it was SO WIERD that he was born on his birthday when I told him he was.Anon