This is a neat little game which gave us a diverting few minutes this lunchtime. Each player is trading in a particular type of sweet and players take it in turns to move the price of any the sweets up or down. Once trading is over you have round where everyone tries to figure out who is selling which kind of sweet. If someone works out which sweet you are trading, you are out. If they get it wrong, they're out. Last player standing with the highest score wins.
Games last around 20 minutes or so maximum. It's quite fun to play, although in typical Computer Science fashion we all massively overthought the situation and I managed to win one by just doing the simple, stupid thing.