In 2000, at a keynote address in San Jose, a mentor and I saw this man speak: Clifford Stoll.
He is, in some ways, my Platonic ideal as a speaker.
Although the clip below is not the same talk, and not as good, it has many of the same elements. He is theatrical, weird, clever, and immensely warm. I was delighted to stumble upon it tonight.
This guy is phenomenal. I only wish I could find the show from 2000. The ending part about the bell was done perfectly, with the rhythm of a great stage actor. (This one is only ok, but it will have to do.)