I used to watch "Piglet's Big Movie" when I was four years old. There is a Carly Simon song in it with the line "a house is built where it wasn't before", and the word "before" is sung with the note held for a while. I thought it was saying "be four", especially since I was four, and would sometimes even sing it changing the "four" to other numbers, like "be hundred".
A childhood belief about misheard lyrics

others believed things like this
- That numbers went 1-99 the A hundred, a hundred and one til a hundred and ninety nine. Then ONE hundred...— Foolhardy
- My mum said that when I used to sing "noahs arc" at school I would sing "who built the arc, no one, no one"— Clare
- I told someone once that my favorite band was the Funkel brothers- Simon and Garth.
(Simon & Garfunkel)— Josie - I thought that the song "Built this City" by starship went as follows. "Milk and Cereal, Rock and Roll"Anon
- I used to believe that numbers had gender, that the odd numbers were boys and even numbers were girls. — Evelyn
- In first grade, I thought that if I've never heard of a word before, then it wasn't a word.— Destiny