When I was in 5th grade, I took trumpet lessons from a guy named Ned.
Ned had memorized a song that listed all the countries of the world.
That’s impressive enough in and of itself, but what’s even more impressive is that this was before the internet was widespread, so Ned had to watch TV until the song came on (it was on a show called Animaniacs which, if you haven’t seen it, you should drop everything and go track down an episode on Youtube), then record the song to VHS, then watch it over and over again until he could write down all the lyrics.
After I saw Ned sing the song one time, I knew I had to memorize it.
So I had him write down all the words for me, and over the course of 3 days I memorized the entire thing.