When I was little, I used to think that a line in Wilson Phillips' "Reckless" went "I want to be a horse's breakfast" as opposed to "impulsive, reckless." I couldn't figure out why anyone would want to be a horse's breakfast. Suicide perhaps?
Garth Brooks' "Shameless".... I thought it was "Shavin'".
Don't know who sings it, but my friend thought the funk song "Doin' the Butt" was actually "Do it in the Butt." HUGE difference!
A childhood belief about misheard lyrics

others believed things like this
- believed the song from Garth..Im Shameless ..was really saying...Im shavin...— Kristin
- in the song "show me heaven" i used to sing "make me breakfast" instead of "leave me breathless"Anon
- I used to believe that unicorns were real creatures. I thought they were just another type of horse.Anon
- I used to think the song "Walk this way" by Arosmith went horse and sleigh insted of singing walk this way.— Derek
- I used to believe that if you ate eggs for breakfast everyday you'd get pregnant...Anon
- I used to believe that serial killers where people that killed u while eating breakfast— nick gunderson