My high school friend, Janice, thought that the song "You're the One That I Want" (from "Grease") was actually "Women in a Boat". (If you say it fast enough, maybe.)
A childhood belief about misheard lyrics

others believed things like this
- I thought that wars had to last four years... just like high school and college.— A. Falk
- Until I was in High School, I really thought that the "underground railroad" was under the ground.— S
- Until junior high school, I thought Monty Python was a wrestler.— Jamie
- 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 the line in the song "Life in the Fast Lane" was "Fights in the Bat Plane".Anon
- I used to believe that you got married right after you finished high school or college. Anon