Paying for coffee with lightning in person at a local coffee shop in my city. I do this pretty regularly, and I always get a little giddy each time. Also, I think being able to gamble completely anonymously, KYC free, at some Bitcoin/crypto casinos is really neat too. I gamble with sats all the time and there are tons of totally anonymous casinos where you can use on chain BTC and simply deposit, play, and withdraw when finished, all instantly and kyc free.