For some reason, in the book "The Restraunt at the end of the Galaxy" (sequel to "The Hitchhiker's Guide to the Galaxy), I thought until pretty recently (I'm 16) that Trillian, the female in the book, was a giant centipede. heh...
A childhood belief about reading

others believed things like this
- I thought "The Hitchhiker's Guide to the Galaxy" was a somewhat casual manual for astronauts.— Katya
- I used to dig a super deep hole thinking it
would transport me to the galaxy — Rafaella - I once thought that snakes had legs like a centipede.Anon
- i thought that we were just a big story book that ended when we died— samantha
- I thought Kaa's name from The Jungle Book was spelled "Car" and that he had a brother named Truck.Anon
- When I was a kid, I used to believe that Gremlins was the sequel to E.T.— Vivian