I played a game called Get The Picture when I was a kid. It has disappeared, but the concept of making funny captions for images is still popular. This was featured on the Twilio Blog not too long ago.
The concept is simple: The host fires up the page on a big screen, then everyone sends text messages to interact with the screen. The host decides when to display entries and vote counts.
I'm working on a different version of this: a web app version using Node.js and Socket.io.