See Randy Pausch, the pioneer of Computer Human Interface, delivering his Last Lecture (literally) at CMU.
Delivered on 18th September 2007, this is video makes him a rockstar of the scientific community putting him in the league of scientists like Richard Feynman, George Gamow, and Gian Carlos Rota. Bravo!
Take hundred minutes out of your schedule and watch this video. You owe it to yourself.