Night Ops Jenga. Honest, its great. You all agree a length of time that the lights are allowed on, say five seconds. You start with a full tower and the lights on. The lights go out and the first person takes a peice. On completion of their go the lights go on for the pre-determined length of time. They go out and its the next person's turn. And so on. Add to it what ever other rules you like, for example you have to sit a metre away from the tower if its not your turn and if the lights are on.