Something funny happened to me and my mom driving home from the mall about a month ago, when the song "Big Ol' Jet Air Liner" came on the radio in the car. I realized already that this was a very commonly misheard song (and with good reason), but was pretty sure I had the right lyrics. So come the chorus, my mom and I (who had not been singing along to the rest of the song) sang two different lines. Mind you, my own came out very loudly as I was trying to sound like an idiot. I guess I got more than I bargained for:
My mom: "Big Ol' Jet Air Liner"
Myself: "BINGO JED HAD A LIGHTER!!"
I am laughing so hard right now I can hardly type properly. I swear to god, listen to the song and sing that lyric along to it, it sounds exactly like that. I still sing it like that because it's so much funnier.
A childhood belief about misheard lyrics

others believed things like this
- I swear I heard a Disney Channel/Radio Disney song where the chorus was a repeated “Damn it”— SpengBab
- I used to think that Steve Miller song "Big old jet airliner" was "Bingo Jed had a light out" — Skeeter
- 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
- When I first heard Bruce Springsteen's song, "Born in the USA," I thought that the song was "Porn in the USA"Anon
- i thaught the michael jackson song billy jean song said Janet's not my son Anon