How do you explain ffr/sm to friends who literally never think about rhythm gaming?

[Shadowcliff]

I never bring it up, except when things have been getting heated in this tournament. And when I do, they either say "that's cool" or ask me to show them, and anyone I show sits through only one song and then they've had their fill, so I think I'm doing something wrong. I wish more people would get excited about a game where the skill cap is ridiculously high or even nonexistent. How???