Imagine yourself sitting on a plane. Players have to cooperate to reach the top of the Mountain and then escape safely, but the Mountain has more than one trick up its ghastly sleeve. In horror, you realize that the higher you fly, the crazier your teammates become! Each step you take, the leader must gather the necessary equipment from all other players to keep on flying.
Quick and clear communication is the key - but how will you stick together when your team starts developing weirder and weirder behaviour?