Like most sentient beings our 8-year-old is well acquainted with the theme to the 1967 Spider-Man cartoon. I think he may have seen some clips on YouTube but mostly it's from me putting it on a playlist we played in the car many times. (The playlist also included the Ramones excellent cover.)
Last week I mentioned there was a song called "Iron Man" and he was interested, figuring it must be about the other Marvel superhero. I pulled up the Black Sabbath track on my phone and played it for him, and... he lost interest partway through and had me stop when it became clear it was not about that subject.
Then yesterday he was humming the riff to "Iron Man" quietly to himself, despite it not having come up in the interim. So apparently that had made some impression on him.
And last night before bedtime he started singing this:
Does whatever an iron can"
Then he chuckled softly, amused at himself.
Kids make you proud in the most unexpected ways sometimes.