Even now, so many years after the end of the show, there are still new fans finding their way into Sunnydale. Buffy doesn't care that they're late to the game. She's been waiting for them - and she accepts all of them exactly as they are. Besides, no matter how many times you may have seen an episode, there's no such thing as an expert. I can guarantee there are always new and intriguing things to discover in Buffy; things that you missed somehow on previous viewings.