There's this cute little youtube channel a fellow rat owner showed me. It has several great videos on quick little tricks you can teach your rats. Of course, they take patience, a few days or more, and only about 5 minutes of training a day so the rat stays interested. I plan on trying some of these.. if I can ever get my rats to like me.

http://www.youtube.com/user/oPuPo#p/u/6/FhZvSoAhqg4