A couple of days ago, our classes chatted online with A.L.I.C.E. (Artificial Linguistic Internet Computer Entity), a "chatbot" the simulates chatting with another person. Several students have requested the link to try out on their own, so here it is! You can also read up on the history of A.L.I.C.E., as well as find general info about machines and their "thinking" capacities.
Remember, it may seem as though you're talking to a person, but "A.L.I.C.E." is really a machine! And...she's learning from your conversation, so don't be mean and try to confuse her.
And, for (albeit confusing) entertainment: A.L.I.C.E. and Fake Captain Kirk (two chatbots) attempting to have a conversation.