This is a fun game. I've played it before irl, and its just as much fun online. There are some really talented artists here, and some funny stuff happens.
http://www.brokenpicturetelephone.com
Somebody writes something, then the next person draws that, then the next person describes that, then that is drawn etc.
Some of my favorite games that happened:
http://www.brokenpicturetelephone.com/view?id=52249
http://www.brokenpicturetelephone.com/view?id=51955
only problem is that the site seems to lag. lots.