A team from The University of Texas have, along with Romanian computer scientist Mihai Polceanu, won a competition for the "BotPrize", which is awarded to whoever can come up with the most "human-like" piece of artificial intelligence in Unreal Tournament 2004.
Why UT2004 and not, say, Counter-Strike? Because the competition was sponsored by UT's publisher 2K games, that's why!
The contestants were judged by a panel of experts according to their "humanness". The average actual human being scored around 40% on this scale, while the winning AI, UT^2, scored 52%, matching the score of Polceanu's MirrorBot.
If you're wondering just how a bot can be tailored to act human, the winners programmed their AIs to do things like hold a grudge (pursuing an enemy if it's not the "optimal" thing to do), move like a human and even act irrationally.
Artificially intelligent game bots pass the Turing test on Turing's centenary [EurekAlert, via Reddit]