My husband has never been very good at getting the lyrics of songs correct, or even products names right (Simmeroff for the vodka and nonfast colour eds for non fast coloureds on the washing machine) but anyhow, one story he told me was on the song Liberator by Spear of Destiny. He would always sing for the chorus at the top of his voice 'I'm a little bit high, a little bit high, a little bit, a little bit' and could not work out why it was called Liberator until some friends corrected him.
A childhood belief about misheard lyrics

others believed things like this
- I used to believe that all the first names of judges was Justice till I was doing my 4th high school year.— Tafadzwa
- i didn't beleive this, but a kid my sister knew thought if he screamed in a really high voice, he ran faster.Anon
- i used to believe that our ansering machine was the washing machine and that it could talk
— tamara - I used to believe that if I put my arm in the washing machine while it was going that it would rip off.— Hannah
- I used to sing at the top of my voice "OLD GIRLS JUST WANNA HAVE FUN"— claire
- I used to believe that if i threw something as high as i could into the air god would steal it.Anon