My dad had explained to me how animals "pair themselves" to make little animal babies (probably after watching humping lions on an animal show or something). I thought I had it all figured out, until I discovered that the human practice of "pairing ourselves" (marriage) didn't resemble the animal way very much, so I candidly asked my dad why humans pair themselves so differently. A deep sigh later, my dad launched into the real story...
The worst thing about this is when I told my friend about my new wisdom, he refused to believe me and beat me up.
A childhood belief about reproduction

others believed things like this
- When I was a child, I used to think that if you eat an animal, you become that animal
— Hmza - I thought for a long time that beaver and badger are the same animal— Ted Snow
- As a young child I thought that sheep and poodles were the same animal.— Jane
- In varsity I went out with a guy who thought a hymen was an animal, that as related to a Hyena. I magine that!Anon
- I used to believe an artichoke was an animal and we only ate its heart. — Laura
- I used to believe that an oilskin actually came from an animal called an Oil.....— Sally