What're the top 3 coolest things you've seen anyone do in crypto, on-chain or off?

(only requirement is it's somehow linked to their address)

Decentralized open source consciousness | Values-aligned communities | citizen of Black Rock City

Cofounder, Managing Partner @ Multicoin Capital

Any you can think of that only a small group of people / addresses have done, because it’s hard to do?

get paid for going to a website (eg axie or rabbit hole)

-cryptography stuff, like arithmetizing (might be using the term incorrectly) complex functions into circuits

-some gas optimizations  

-leaving Easter eggs somewhere deeply hidden (like the message in the last POW block)