Personal greatest moment was 2v2 UT CTF in CTF-FacingWorlds.
I was teamed up with some random guy, he was fairly good, nothing to write home about, playing the best ranked player in Australia at the time, and one of his friends. The match began badly, my team losing 2 captures in the first 3 minutes, with 17 minutes remaining, there was plenty of time for a victory from the opposing team. The following 15 minutes were spent playing defensively, simply holding off what seemed to be the inevitable. with about 3 minutes remaining, the match was pretty much wound up, until I ventured for a capture, armed only with the sniper rifle, picking off the opposing team with a string of headshots, getting the flag, and running toward our base, facing the spawn points, capping them off as they came, returned for a hard-fought capture, 2-1 the score. There was roughly a minute and a half remaining, and we needed one more capture to force the match into Overtime. I played defensively this time, capping the other team at their spawn point with the Sniper Rifle, again, my teammate managed to get a capture with about 20 seconds remaining, forcing the match into overtime.
What followed was a gruelling stand-off that easily lasted about 20 minutes, both my team adn the opposing team coming close to captures, only to be gunned down in our own respective bases. Again, armed with the Sniper Rifle, my teammate with the Rocket Launcher, we made a hasty assault on the opposing teams base, my teammate picking up the flag, teleporting into the sniper nest, jumping off the edge (Why I don't know, that's intant death) and dropping the flag. Me being in their base at the time, spawn capping again (Hey, I'm an asshole) realizing he'd dropped the flag, running out of the base, picking up the flag, running toward my base, dodging rockets, sniper shots, coming over the crest of the hill, dodging like crazy, breaking out into laughter as I entered our base, and returned the flag for a 3-2 win in overtime.
Sorry for the length. :lol