While it is not as good as the first episode of "Treehouse of Horror" (That will always be the best episode I'm sure) this episode is terrific and definitely worth watching. One thing The Simpsons has always done well in its twenty seasons is parody. That certainly shows here with the excellent parody of one of the best episodes of the classic series The Twilight Zone. From the hysterical scene at Dr. Monroe's office ("I'm not nodding. It's the air conditioning.") to the segment's very clever conclusion, it's great fun to watch. The final segment is just as good. Terrific.