I saw a cartoon on Sesame Street once where a kid didn't like his mommy, and went to a Mommy Store to trade her in and pick out a new mommy - they were posed throughout the store like fashion mannequins. Since it was Sesame Street, I believed it - and it scared the hell out of me.
A childhood belief about cartoons

others believed things like this
- I used to believe that “Emo” was related to Elmo from Sesame Street.Anon
- I seriously used to believe that Bert from Sesame Street lived in my closet and that he was going to kill me.— Liz
- I thought that Count Dracula was the count from Sesame StreetAnon
- When I was young, I said to my mom, "Mommy, make the sun go down!"Anon
- I used to believe that Mother Nature was The wife of God. She was the mommy and he was the daddy. — Dawn
- When I was a boy I flushed my fish down the toilet thinking that it would go to its mommy and daddy.— Jeremy Clark