This is a very interesting insight, and one I've run into when I tried to introduce non-Buffy-fanatic fans to the show.

I had a lack of success getting someone started on OMWF, too, because she couldn't see what was so awesome about these people singing.

My pick for the best humorous episode to show a newbie is "Life Serial," and not just because it's one of my all-time favorites. There's enough situational humor -- Buffy's repeating time in the magic shop, anyone? -- that's funny even without much context.