This is a very cool little "game" that asks you to think about an object, and through a series of questions, it will almost always guess it. The object you think of should be something that most people would know about, but, never a specific person, place or thing.
I only completely stumped it once out of about a dozen tries. The object about which I was thinking when I stumped it, of all things: a penis.
Most interwebnet games links are a bit overrated, but this one is really very interesting!