When I was about 8 years old, I used to watch a few TV programs from time to time. One of them was "Please Don't Eat The Daisies", which was a short lived sitcom about a family with four boys (two of them twins), similar in style to the Brady Bunch that came out a few years later. In "Daisies", the mother was a bit "bubble headed", a little wacky/silly. Somehow I had the idea that when a mother had a lot of kids, it kind of drained her, to the point where if she had too many she'd become really stupid. So I warned my mother not to have any more children (I was the oldest of 2). She asked me why and I said "because I wouldn't want you to become stupid." Needless to say, I went to bed without any dinner that night. I still believed it was true until I was a few years older and I asked a few "careful" questions of my school science teacher, to later learn how silly the idea was. ;-)
A childhood belief about tv shows

others believed things like this
- I thought the word lackadaisical was something to do with lacking daisies.Anon
- my mother told me if i ever swallowed chewing gum i'd turn into a pig, i believed this for many years.— stuart hayward
- when i was little i asked what time midnight mass started.
i honestly had no idea.— what time?? - My oldest sister is 15 years my senior. I used to think that she was older than my mom.— Callie
- I used to believe an "Ego" was a kind of hair style, similar to a mullet.Anon
- I actually asked my mother if mixing girls' poop and boys' poop would cause an explosion.— kraine