If you’re wealthy, instead of leaving your money to charity, I prefer the idea of leaving it to purposes that people will either laugh at or ponder for many years.
This can be as simple as treasure maps sent to random people around the world, that actually lead to treasure, but weird treasure, like gold coins stamped with arcane symbols, silver statues of space aliens, etc.
Or pay an artist to make a giant statue to some character actor:
Or some kind of Piltdown Man project. Mayans vs. Vikings, that sort of thing.
Or pay genetic scientists to make some weird new species of animal to name after you. That can breed and survive in the wild.