Is there such a thing as a purely selfless deed--one with no hidden motives whatsoever? Walter F. Rutkowski from the Carnegie Hero Fund spends his days measuring good deeds by some very stringent criteria--such as risking your life "to an extraordinary degree while saving or attempting to save the life of another person." We got in touch with three of these bona fide heroes to ask what went through their minds the moment they leapt into action. The heroes: Lora Shrake (who squared off with a 950-pound bull); Bill Pennell (who repeatedly dove into a burning car for survivors); and Wesley Autrey (who jumped in front of a subway train to save a fellow rider).