A few months after World of Warcraft came out (around Feb 2005) I led a group of the highest level players on the server with the goal of killing the only "raid boss" that was accessible at the time: Onyxia the dragon.
Doing a raid on a boss took 40 max-level people working together, using voice-chat software (complimented by in-game chat) to coordinate during the fight and come up with strategies.
For about a week 40 of us had spent 3-5 hours per night repeatedly dying in attempt to kill Onyxia. At the time less than a dozen groups had killed her in the entire game. This was before WoW was a mainstream game and before anything like strategy-guides for it existed.
We were getting close, and were figuring out the final phase of the battle. Someone started recording videos of the raid and captured an extremely emotional moment: when we all died less than 1% away from our goal. This is that video (audio required):
What you're setting is Onyxia (the big dragon) finishing up killing every member of our raid with less than 1% of her health remaining. As soon as she begins to reset -- signifying we had failed yet again -- the entire chat blows up in angry nerds, myself included.
If I recall correctly, we gave up for the night after this failure, and came back to kill her the next day. It would be a month or two before anyone else on our server accomplished killing her. Someone also recorded the full first kill which contains all of the voice-chat and the response when, after over a week of work, we finally accomplished what we were after. That video (228 megs) is available here: http://discore.org/Goonifistvsonyxia.wmv