When I was 4 years old, I knew that milk comes/came from cows, but believed/thought only for a little while, that apple juice came from horses.
A childhood belief about drinks

others believed things like this
- When I was little I thought cows married horses, cows were all female and horses were all male. — Sheila
- I used to believe that milk came from cows, so water came from horses. hahah— Melissa O'Connor
- I used to believe chocolate milk came from brown cows and regular milk came from black and white cowsAnon
- i used to think chocolate milk came from brown cows and normal milk came from white cows Anon
- I used to believe that brown cows made chocolate milk and white cows made regular milk.— andrew mient
- as a young child i thought poo was brown from eating chocolate and pee was yellow from drinking apple juice!Anon