Here is another absurd thing I believed as a child:

I was frequently awestruck by music radio when we were in the car. Not because music is amazing (though it is), but because I thought that every band and every singer was doing every song live at the radio station. I thought commercials were just put in between while they waited for the next person to get there.

…I might also add that I was not convinced every band/singer was human. This song here?

Yeah. I always pictured AC/DC as orcs. Like in the Rankin-Bass version of The Return of The King.

Yeah. Nothing alike, I know. But the child me was pretty convinced that orcs existed. And that they played music live on the radio sometimes.