Ok someone in another thread linked to http://www.jabberwacky.com so I checked it out.
And proceeded to have this snippet of conversation with it:
Me: Nothing happens.
If you’re a text adventure fan, it will make sense.
Anyway, the thing’s response system is pretty cool, and can lead to some really… interesting conversations. At one point, it asked me my name:
Jab: Oh, my name is Cinderalla.
Me: No it isn’t.
Jab: What’s my name?
Jab: That’s your name!