I used to believe that "Coco Pops make the milk go 'round!" because in the TV ads you'd see the cereal in the bowl turning slightly.
The idea that I misheard it and that Coco Pops actually make the milk go *brown* never occurred to me.
A childhood belief about milk

others believed things like this
- I used to believe that eating Coco Puffs with Chocolate milk would give me diabetes.— Julie
- I USE TO BELIEVE THAT BROWN & BLACK COWS MAKE CHOCOLATE MILK— TINA
- I used to believe chocolate milk came from brown cows and regular milk came from black and white cowsAnon
- I used to believe that african american people were black because they ate too much CoCo Puffs— Jessica
- I used to think that when you poured milk into your cereal, the cereal multiplied.— Allen
- i used to think chocolate milk came from brown cows and normal milk came from white cows Anon