At NYU's ITP, I heard the shrill and desperate scream of a child. It turned out to be a kid playing Nobu Nakaguchi's multiplayer interactive telephony called Tuuug of War.
The game is pretty simple. Users dial in, choose a team, and compete in a game of tug of war. Instead of pulling on a rope, each player has to scream TUUUG into their handset as loud and long as they can. We were told that phones with bad voice volume are at a disadvantage, specifically iPhones. [Tuuug of war at ITP]