We often see in films and television series stories about how a particular adventurer stumbles across an ancient underground city or tomb seeking lost treasure. And then at some point the protagonist or his party would inadvertently trigger some booby trap by means of some mechanism set in place by ancient workers. My question, is, it really possible for such mechanisms, which usually comprise of rocks to function as they should after centuries they were built? At times depending on the film or TV show, the trap mechanism may date back to only about a few hundred years old. But in general are such stories credible in any way?