My vote is for "Not Without my Anus", which I find to be a very good episode, and it really stands out among the earliest episodes. It is my favourite season 2 episode, and I may even say it is better that the entire first season as well. As I said before, SP was a victim of TV Tropes's "Early installment wierdness", so doing something different than usual was really interesting. Although I do not think the show picked up until season 3, this episode was equally as good as the best that season offered, maybe better.