My brother and I used to believe the lyrics to a Paul Young song were: "Everytime you go away, you take a piece of meat with you". (it's actually: "you take a piece of ME with you") We found this so funny, it had us rolling around in tears for ages everytime it came on the radio.
A childhood belief about misheard lyrics

others believed things like this
- I used to hear "Everytime you go away, you take a piece of Meat with you"
Makes a nice light snack I spose.— Linda - That at meetings adults sat on plastic chairs surrounding a large piece of meatAnon
- My older brother told me that everytime you sneezed your lungs would bleed. I believed this until I was 21!— Gem
- my brother used to believe that Ground Chuck meat was actually groundhog meat. Anon
- i used to believe that one piece of ear wax was actually called a wach. — rachael
- I used to think that a gherkin was some kind of piece of machinery. I wonder where I got THAT from...— Some Idiot