Ever heard that story about the mother who lifted the car off of her son? I thought it was an urban legend until I looked it up. But apparently it's true: In 1982, Angela Cavallo saw her son being crushed by a 1964 Impala. Seeing that happen brought Angela to a state of panic so severe that she temporarily gained superhuman strength -- enough strength necessary to lift the car off her son. It's called "hysterical strength" -- tremendous strength brought about by severe stress.