Survivor: Panama
Immunity Challenge: Each tribe member will kneel at the end of a long plank hanging over a pit of water. They'll be holding on to two ropes connected to a hook with weights. Starting with twenty percent of their body weight, the weight will go up by another ten percent every fifteen minutes. When the weight becomes too much to hold, the ropes will slip from their hands, the plank will give out and they'll fall into the water. The last person left standing wins Immunity.