He paid 10,000 bitcoin for two pizzas — worth over $1 billion today

On May 22, 2010, programmer Laszlo Hanyecz posted on a bitcoin forum offering 10,000 BTC for someone to order him two pizzas, since bitcoin itself had no exchange price yet and no one would sell it to him for cash. Another user accepted and had two Papa John's pizzas delivered. At bitcoin's later peak value, that transaction would have been worth well over a billion dollars.

— Wikipedia contributors, Bitcoin Pizza Day — First known real-world bitcoin transaction, May 22, 2010