impressing: twenty questions

i stumbled across the AI-game “20 questions” some days ago (don’t remember where) and it stayed open in my browser until i today found the time to play. the first question it asked me was: “imagine something that is generally known. is it an animal, a plant, a mineral, something else, or unknown?” after further questions of the type “can you carry it?” the programm responded with: “i assume it’s a stop sign.” hell, it was! i’m impressed.