My bedroom and my parents' bedroom shared a wall and I could hear whatever they watched on TV. One night they watched a special on PBS about breast cancer. No big deal, except that I was eleven and just hitting puberty and for about six months I was certain that those little lumps were cancerous tumors.
It took a nice little diagram of breast development to convince me that I was wrong.
A childhood belief about rude bits

others believed things like this
- up until puberty I thought that my nipple would inflate like a balloon to form a breast— EiEi
- When I was little I used to think that women had two hearts - one inside each breast.— Rick
- My sister used to believe that mayonaise made your breast grow.— Honey
- When I was little I thought that black babies who were breast fed got chocoate instead of white milk.— Susan
- I always wondered why shepherds washed their socks by night. (correct lyric: watched their flocks)— MaggieNJ
- I used to believe my bedroom closet was actually a time machine.— Carrie