I recently learned about this old game, 20 Questions. In this game, one of the players, the Answerer, thinks of an object, a common noun, and other players take turns to ask Yes/No question to him. Like, Is it less than 2kg ? , Does it run on electricity, Is it worth over 1000$? etc. If they figure it out with less than 20 questions, the Askers win, otherwise the Answerer wins. The person who finally figures it out got to be the next Answerer. I tried playing this game with my brother (I asked all 20 questions) but found it incredibly hard to come-up with good questions. It was also because I needed to keep track of all my questions and answer in my head. Why don't people play this intelligence demanding game here? This game suits PF :) .