Who is the best presenter? Who is the worst presenter? Why?

Hi everyone... In my opinion, i think Randy Paunsch is the best presenter. First of all, he started his presentation with a fact then he crack a joke. That was interesting. Besides, his slides are full of pictures rather than too many words. He had explain each and everything briefly. Moreover, his presentation is spontaneous where he never refer to any written short notes. He face the audience and speaked clearly which was the plus point for him 2 be choose as the best presenter.
I had learned few things from the video clips that i had watched. First of all, we must prepare slides that is interesting and not too many wordy. Then, we start the introduction of the presentation with something interesting like cracking a joke so that it can attract the audience. Then, face the audience while explaining each slides. The body language is very important for a good presentation. Finally, its best to end up the presentation by giving moral values or some advises which benefits everybody.
That is for now. Thank you.