Yeah, I was kinda thinking about it, too, and for some reason I was also having a hard time thinking of my favorite episode.
Pumpkin people was the first one to come to mind for me. I think that one's definitely the best representative of the show as a whole. It just nails the vibe. But, I don't think it's my favorite. Maybe the tavern or the ghost one?
My problem is they're all too good, so I want to start saying all of them. :p