What should I write for my 400th list?

Inspired by @PeteOnEarth's centenary check-ins
  1. THE 400 CLUB: THE ONLY THINGS LEFT TO TALK ABOUT AT THIS POINT
    Suggested by   @PeteOnEarth
  2. Write about how under-appreciated I am.
    Suggested by   @alligeeshow
  3. Do a roundup of your best lists.
    Suggested by   @element75
  4. Sea otter gang wars
    Suggested by   @bluepuddles