My older brother used to listen to the song Anarchy in the UK by the Sex Pistols. I used to love singing along with it, but when our parents heard I'd get in trouble, and so would my brother for letting me listen, as they didn't approve of the lyrics. This is why I always used to believe the bit in the theme song to The Wonder Years went '...and I'll try not to sing anarchy' instead of '...and I'll try not to sing out of key'
A childhood belief about misheard lyrics

others believed things like this
- When Madonna sang "let the choir sing" in "Like a Prayer", I thought she was singing "love by proxy"— Kristen
- I used to believe that the boogie man would come and get me if I didn't listen to my parents.Anon
- I thought that singer/songwriter was spelled this way: sing-a-song-writer...Anon
- in the song "show me heaven" i used to sing "make me breakfast" instead of "leave me breathless"Anon
- My brother was listening to The Corrs and instead "leave me breathless" he would sing "give me breakfast".Anon
- Does anybody remember that song "OUT OF REACH" well i remember i used to sing it as "BATTEERRRRYYY". — meeeeeeeee