One of the things I love about the web is the way that people have made use of it in so many different ways. One of the uses I found earlier was this 20 questions site.
You think of something and it tries to guess what it is within twenty questions. The amazing thing is that it seems to be quite accurate and it learns when it does not know what it is.
Drop over and see if you can confuse it and have it ask more than twenty questions.