I agree. On FFXI, I had the fortune to be with a wonderful linkshell that did a lot of things first on our server.
I was in the first party on our server to defeat Diablos and get the summon. We then proceeded to a low level zone near Windurst to show off.
I was in the first party to defeat Prometheus on the server, after the final COP update was released.
Our LS was the first to defeat Jorgumand on our server, a week after we spent 8 hours on him without a win. We also were the first to take down Vrtra.
My best gaming memory is the 8h first release Tiamat in XI. The wipes at 1% and the fun seeing people full caped deleveling to 74.