On the topic of "teaching as performance", this video making the rounds is by Richard Bungiro, Immunology lecturer at Brown. He calls this "immunolo-glee", "Don't Stop B-cell-ievin'".
Kudos to Richard -- it takes guts to sing in front of students, and I think anything to make science lectures exciting is a great idea. (You know, give them some pep -tides*)
Here's the clip:
(*) Sorry, couldn't resist.