Last night, I went with my family to see the play "Joseph and the Amazing Technicolor Dreamcoat." One of the songs by Joseph's brothers, called "Canaan Days", was sung with a very silly, over-done fake French accent. They were singing "Lift your berets", and it was being pronounced sort of like "BELL-ayz." I heard this as "Lift up your bellies," which made no sense. I had this weird mental image of these guys laying on their backs and presenting their bare stomachs to the king.
The next one is from the same show. The song is "Go, go, go Joseph." The Narrator is introducing the butler, and she says, "He was the Jeeves of his time." I heard this as "He was the CHEESE of his time." I spent most of intermission puzzling over this line and trying to figure out what the butler had to do with a chunk of cheese.
(I shared both of these with my mom. She was quite entertained.)
A childhood belief about misheard lyrics

others believed things like this
- I used to think Joseph of Joseph and his amazing techni-coloured dreamcoat was Jesus' dad. Anon
- I used to believe that Joseph of the OT and of the NT were the SAME dude.
Man, talk about being OLD!
— Kitty Lover - At the time I thought the moon was made of cheese and with oceans of cheese— 123
- I believed that Jesus Christ was the son of the Christ family, i.e., Mary and Joseph Christ.— David Araújo
- I thought that the star that Mary and Joseph followed was called Yonder, as in 'following Yonder star."— Kairow
- In a religious song, instead of “Jesus Christ” I heard “Cheese is Prize”— EJ