Back when I was younger, I got very into Ricky Martin music. Remember his song, "Shake Your Bon-Bon?" Well, there's a line in there where he says,
"I see your silhouette,
Are you my Juliet?"
However, when I heard this line, it got all slurred together in my ears, and I heard it as,
"I see your silhouette,
Are you magillient?"
"Magillient" isn't a real word by any stretch of the imagination, but since I was convienced that that was what he was singing, I tried to look it up in the dictionary. The closest word I could find was "malignant," which according to the dictionary ment "a life-threatening cancerous tumor."
Thus, I believed that Ricky Martin had some kind of strange cancer fetish.
A childhood belief about misheard lyrics

others believed things like this
- In first grade, I thought that if I've never heard of a word before, then it wasn't a word.— Destiny
- I always thought the dots in tapioca pudding were fish eyes.I didn't eat it for years!Thanks alot Ricky!!!— Tapioca
- I used to believe Martin Luther King chose your birthday.Anon
- I used to think that the line in the song "Life in the Fast Lane" was "Fights in the Bat Plane".Anon
- When I was young, I heard the word 'minion' for the first time and thought it was a miniature onion.— Karin
- For years I heard the word "pedophile" and thought it meant a pedicurist's tool.— Lauren