I thought the AC-DC song Dirty Deeds done dirt cheap was Dirty deeds thunder chief. It didn't make sense to me until my girlfriend asked me what the hell are you singing. It makes sense now
A childhood belief about misheard lyrics

others believed things like this
- a friend thought that the song "dirty deeds done dirt cheap" was saying "dirty deeds dunderchief"— dubs
- when i was younger i thought ac/dc's dirty deeds (done dirt cheap), was dirty knees and the thunder cheeks.— S
- I thought the lines in the sky left behind by airplanes were "sky scrapers". Makes sense.Anon
- I thought a major general is more powerful than just a general (which still kind of makes sense to me)— Demond
- I thought it was impossible for anyone to lift more than their own body weight. Just seemed to make sense..— Xenomorph
- When I was little, I thought that Water Towers were full of dirty laundry. Why? I dont know.Anon