When my brother(caucasian) and my godbrother(african american) were little they decided that the difference in their skin color was because one drank white milk and the other drank chocolate milk.
A childhood belief about skin

others believed things like this
- Chocolate, they say, rots your teeth. I believed if you drank chocolate milk, your bones would be brown.— Dellio
- I used to think that if you drank too much milk and had a nosebleed, your blood would be white.— Tina
- I used to believe that people who were african american were dark because they drank to much hot cocoa.Anon
- I thought black people were black because they drank chocolate milk. — Shelby
- that black women breastfed chocolate milk instead of white milkAnon
- I used to believe the milk would get sad if all I ever drank was koolaid.— al