I'm not good at memorizing or remembering things. Ranked by my perceived-memory difficulty, easier to impossible.
  1. All the US Presidents, in order
    Static
    By choice at age 50.
  2. Solar System Planets
    Static
    Elementary school, back when Pluto was still a planet.
  3. HTML 2.0
    Static
    1995, for work
  4. Song Lyrics and accompanying Guitar Chords
    Giphy downsized medium
    For various random one-off performances.
  5. Gettysburg Address by Abraham Lincoln
    Static
    Elementary School?
  6. Tap Dance Choreography
    Giphy
    By choice, ages 47-55
  7. Jabberwocky by Lewis Carroll
    Static
    Junior High School English class
  8. Names of my wife's 18 Utah cousins
    Static
    1987-present (And their X children, where X = I'm still not sure how many there are?)
  9. Various elements of Linguistics and Semantics
    Static
    For a grad school English course taught by a fan of Chomsky
  10. Periodic Table of the Elements
    Static
    High school chemistry. The one D grade I honestly earned.