If you just wanna play for fun, how about the following one?
http://aimovie.warnerbros.com/html/flash.html This chatrobot is programmed to an 8-year-old girl.
Her name is Alice.
The funny thing is...If you yell at her "I love you and I want to fxxk you"..
Sometimes she will tell you "1,000,000 people want to do that..."
And you can try to ask "who is the president of USA?" The answer will make you orz....