My sister used to believe that mayonaise made your breast grow.
A childhood belief about rude bits

others believed things like this
- I believed until I was 18 that if I got tuna in the mayonaise jar, I would die the next time I ate it. — Sue
- When I was little I used to think that women had two hearts - one inside each breast.— Rick
- up until puberty I thought that my nipple would inflate like a balloon to form a breast— EiEi
- When I was little I thought that black babies who were breast fed got chocoate instead of white milk.— Susan
- My sister ate fish food one day and she was convinced that she was going to grow scales— leohauoli
- I used to think soup actually made you grow up.— Marie91