I believed until recently that Queen's "we will rock you" when they say " waving your banner all over the place", that they actually sang "Blood and mud's all over the place"
A childhood belief about misheard lyrics

others believed things like this
- I heard the song about Heaven being a place where nothing ever happened and thought, "What a boring place."Anon
- I used to believe that flea markets were a place people sold fleas, or the place was infested with fleas— Kelley
- I always believed that we lived in Manchester (we didn't) but it was always the main place on the local news!— Richard M
- Until I was about 13, I believed that the Gulf War took place near the Gulf Of Mexico.... — D
- I used to believe that funerals were a place you went to buy fruit.— Paulette
- When I was 5, I thought the "restroom" was actually a place you went to take a nap. Anon