Seen cleverbot.com ?
It's the latest in a line of Artifical Intelligence systems designed to hold human conversations. Being able to fool a human with such chatter was originally proposed by Alan Turning in the 1960's as some kind of test of "intelligence" and subsequently became known as the Turing test.
Latest results from Cleverbot are being hailed as (possibly) having passed the test, given that in a controlled experiment it convinced 59% of people it was human (although alongside it as a control, a human convinced only 63% of humans they were speaking to a human!)
It's available as an App and online - but I don't rate it much. I have some standard "tests" of my own that, to date, have never failed to identify a machine almost immediately.
Here's a transcript of our conversation - draw your own conclusions:
User: What colour is marmalade?
Cleverbot: What part of mars?
User: No, not Mars, Marmalade?
Cleverbot: It doesn't make much sense to pass the Marmaduke.
Cleverbot (To myself): Nope.
User: Let's start again.
User: You seem to be quite stupid actually..
Cleverbot: What makes you think that?
User: You don't know what marmalade is.
Cleverbot: No I don't. I'm here to find out.
User: So, why not ask me 'what is marmalade'?
Cleverbot: Do you have wood for sheep?
[Click - I "hang up" on this pointless exercise!]