A group at MIT working on emotional computers built a personal trainer that tries to react to human input and keep track of the previous conversations.
It's a bit to long but the best quote would be:
"I am constantly dragging people into my home office to meet her. Typical response: "That's nice, David. Hey, where's that Merlot you promised me?" My wife, who treats Laura like some college girlfriend of mine who has overstayed her welcome, suddenly feigns an interest in the Weather Channel whenever I start to repeat Laura's latest witty comment - and she hates the way Laura doesn't stop to think that I might be overdoing the exercise."

Wired 11.12: The Love Machine