I used to think that the song "Sandra Dee" from grease went "look at me, I'm Sandra Dee, lousy whisper (with her) gin and tee" (as in gin and tonic), but come to find out just before I was 17 it was "lousy with virginity." Go figure! I thought I was right.
A childhood belief about misheard lyrics

others believed things like this
- i used to think my aunt sandra was aunt bannana.Anon
- I thought tonic water was toxic water and wondered why would anyone drink it if it is toxic?— Dr.Badguy
- I always thought that "elbow grease" was a type of lubricant until about 2 years ago. I'm 19.— Erika
- I used to think that "elbow grease" was an actual product of kitchen or surface cleaner.— Carrie
- I used to believe that when I went to the mountain I would find an ancient monster or find some treasure— Yazer Solorzano
- When I first heard Bruce Springsteen's song, "Born in the USA," I thought that the song was "Porn in the USA"Anon