That was the famous bitcoin pizza[1][2] (worth $120,000,000 as of this writing), and it is believed to be the first real-world purchase using bitcoins.
[1] Original thread: https://bitcointalk.org/?topic=137.0
[2] The pizzas: http://archive.is/a1IRg (archive link so we don't hug laszlo's servers to death.)
I'm not one for all that "if you bought $100 of bitcoin in 2013..." stuff, but wow, that first sentence...
Though I guess if he had 10,000 to blow like that, he probably had a lot more, and probably isn't short of a few now. (Hopefully anyway.)
I think I'd rather be someone who paid 10,000 for two pizzas though (which I assume was more or less the going rate in 2010), than being one of the people who didn't or couldn't take him up on the offer - two days later and nobody had done it.