whats your favorite piece of trivia about the games?

like the title says, whats your favorite little bit of info about the games? it could be anything about the development or any in-universe lore.

for me, i really thought it was interesting to hear about how some remixes from tengoku were used to help the developers with their rhythm by dancing to it. that bit has stuck with my for a while! its kind of a funny thing to imagine lol