Laszlo Hanyecz is the person famously known for purchasing two pizzas for 10,000 bitcoins in May 2010. This transaction is widely regarded as the first real-world transaction involving Bitcoin. At the time, Bitcoin was still in its early stages, and its value was nominal. However, with the exponential rise in Bitcoin's value over the years, those 10,000 bitcoins would be worth a staggering amount today. This event is now commemorated as "Bitcoin Pizza Day" in the cryptocurrency community.