Besically, its a site with a program that asks you to think of a thing. Then it asks you 20 questions and tries to guess what it is. It is in fact surprisingly effective (The first time it almost got it right, guessing a "double bass" when I was thinking about a guitar, and then again when it the second time guessed "sitar"
), but sometimes it gets really weird results, like here
Oh, and if you get "saxophone" as result, reload until you get the other result.
Edit: And here is a link to the main site: http://y.20q.net:8095/btest


Oh, and if you get "saxophone" as result, reload until you get the other result.

Edit: And here is a link to the main site: http://y.20q.net:8095/btest