Absolute Powerpoint "What I miss is, when I used to lecture without PowerPoint, every now and then I'd get a cool idea," he went on. "I remember once it just hit me. I'm lecturing, and all of a sudden I go, 'God! "The Wizard of Oz"! The scene at the end of "The Wizard of Oz"!'" Nass, telling this story, was almost shouting. (The lecture, he later explained, was about definitions of "the human" applied to computers.) "I just went for it--twenty-five minutes. And to this day students who were in that class remember it. That couldn't happen now: 'Where the hell is the slide?'"