it's a cat, duh!   (geekin, quote)

I'm suddenly envisioning an advanced, human-quality AI in an abandoned lab, where there is no input but when a cat walks over a keyboard that has been left active, which the cat does regularly because of that psychic perversity embedded in their feline genes.

The AI never had the keyboard input explained to it, and all other input is turned off. So it's in limbo, except when it gets characters splattered at it, apparently at random...
 - a sentient post