It sounds as if you are an interesting teacher, and God knows there is a shortage. I'm glad you enjoyed it, as did I. I've heard that routine quite a few times and never tire of it. I'd put it right up there behind Abbott and Costello's "Who's on First".
I think the only "drawback" for lack of a better term, to my class at the local community college, is that it is more challenging than UNC's class here in town - I use the old UNC format, which they changed to an "easier" (meaning: less work, less brain-pain) format than mine. My class learns HOW to think, not WHAT to think that many UNC professor's adhere to, and from a VERY liberal, anti-Bush, anti-America perspective. My students are taught how to come up with their own opinions - they find it hard but very refreshing and educational.