I used to believe that 'heavy metal' meant the musical instruments were literally heavier than usual because they were made of steel or something.
A childhood belief about songs

others believed things like this
- When I was a child, I thought that the Heavy Metal was Satanic music.Anon
- steel wool comes from steel sheep— tg
- I used to believe that Metal music was when a bunch of people would bang metal together to make noise. Ha ha.— Kassandra
- I used to believe that there was special metal laid in the motorways that made the cars go faster!!— angela
- My daughter used to believe that when someone is fired from their job, it meant it literally.— Sally's mommy
- When my mom would say that my eyes were bigger than my stomach I thought she meant it literally.— Amanda