Video games have the separate complication, though, that dialogue needs to holistically work with the rest of the plot. There's no such requirement for a very fancy Furby.
I've wanted an evil Teddy Ruxpin that is really evil and wants to lower your utility function and tries really hard to do it (violate the first law of Robotics) but just isn't strong enough to really hurt you. I figure though the bar for creating a catastrophe is not really that high, all it has to do is start a fire.
