When I was a child, I believed that the tallest man in the world drives a mini, which had no front seats, i.e. back seats only.
I believed that till I was 25 years old.
A childhood belief about cars

others believed things like this
- I used to believe that toilet seats were for kids only and that adults sat directly on the bowl. — Evan Klyne
- i used to believe that my father was the tallest man in the world— tiara
- In the 1990s, when I was a kid, I used to believe that Michael Jordan was the tallest man in the world!— Sara
- Until a few years ago, I believed this was a "doggy dog" world, rather than a "dog-eat-dog" world.— jemima
- When I was 6 or 7 years old, I absolutely believed that if a thermometer broke--the world would end. — Suzi
- my dad said to me once that if I swallowed toothpast one day I would die! I believed it till I was 12!!!— Floobloom