When I was about 6 I used to believe that a line in Abba's 'Take A Chance On Me' was 'You wanted to leave me there, afraid I would love a bear'. Actually it is 'You wanted to leave me there, afraid of a love affair'.
A childhood belief about misheard lyrics

others believed things like this
- I thought the cremations were for people that wanted their love ones buried at home.— Helen
- I used to think that gummy bears were evil and wanted to take over the world. I'm afraid of them to this day.Anon
- I always hear Manic Street Preachers 'You Love Us' as 'You Love Arse'.— Lou
- I used to believe that the B-52's song "Love Shack" was actually "Love Shark!"— Natalie
- I used to think the song "love the one you're with" was called "love the one, your win. — Glowworm
- I am Canadian and when I was little I would sing "True Pastry Love" instead of 'True Patriot Love"— Jess