When I was little, my mom was pregnant with my little brother. She was acting and looked different and i didn't know why. I asked my father and he said that she was really an alien.
I believed him.
A childhood belief about getting pregnant

others believed things like this
- When I was little I used to believe that God looked like the Great Gazoo (the alien from "The Flintstones").— Susan
- I thought the ball-headed person in the Bic logo was an alien and communicated using alien-like noises.Anon
- I got given a box of slime marked "alien puke" and asked if E.T. was all right.Anon
- Oh oh, I'm an alien, I'm a little alien...
Legal maybe?— Marina - I asked my father what holy water was. He told me it was the priest's bathwater. — Gwen
- I used to believe if I fed my cat dog food that he would turn into a dog or start acting like one— Clodagh