My dad used to sing along to madonna's Erotic in the car when he was taking me and my 13 year old friends to the school disco. This in itself is cringy enough, but he used to sing
"You got it, you got it...." Instead of "Erotic, erotic" by mistake which had all my friends in silent hysterics and daring each other to tell me dad the real lyrics. I got slagged off for my dorky dad for about two years after that.
Also me and my sister used to think that the Fine Young Cannibals were singing "Milkshake, where have you gone?" instead of "Lucy". Thought they had a bit of a Macdonalds obsession
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
- my friends mom used to sing "you talk sense" instead of utah saints.— nikki
- My mum said that when I used to sing "noahs arc" at school I would sing "who built the arc, no one, no one"— Clare
- Did anyone else sing "Hark, the hairy angels sing"?— Jill
- My sister used to sing Kylie's "cheese on my pillow", somehow tears works better.— Tom
- I thought that the line was "Lucy in the Sky with Linus" (not lucy in the sky with diamonds)— Forrest