Try Qcast, a simple trivia game for you and your friends! Connect any number of devices to a Google Chromecast device to join the game (all players need to be on the same network.) The first player to reach 100 points is the winner, everyone can get the answer correct - how much the answer's worth is up to you.
This is a project I started based on a simple idea I've had since the chromecast was released. I'm open to suggestions. If you'd like to submit a question you can do so here: http://goo.gl/chro3r