When I was a child, I heard the word "boughs" in "Deck The Halls With Boughs Of Holly" as "bowels" instead, and this was curious to me. At that time I'd never met anyone named Holly. Later, the first time I met a girl named Holly, I would associate her for the longest time with a vision of her decorating the halls at her house for Christmas with her poop.
A childhood belief about misheard lyrics

others believed things like this
- When I was little I thought that Buddy Holly was called Bloody Holly!— Catherine
- i thought that if i dressed in my holly hobby doll's clothes, no one would be able to find me.— pikl
- I used to think Buddy Rich was called Buddy Rich because he was my dad's friend, same with Buddy Holly. Anon
- When I was young, I heard the word 'minion' for the first time and thought it was a miniature onion.— Karin
- when i was growing up i had two imaginary friends. One was named Jennifer, the other was named Onion.— Tessica
- I used to believe there was a Russian Leader named Garbage Trough and an Arabian named Are A FatAnon