A favorite of mine as Buffy is attacked by a demon shooting a chemical into her and making her see another world where she's in a mental institution. Her boss calls her she sees a doctor telling her its time to take her meds of fighting demons turns into orderlies trying to restrain her. She sees her parents are still together and happily married begging her to get better. I find it compelling as you wonder which world is real or fake as both have good cases for being the true world and the ending does nothing to clear it up as the last shot is of her shutting down in the normal world.
I just wish it went further with the concept by having Xander as one of the orderlies or Spike as a fellow inmate with a violent streak to make sense of who these people are and why she pictures them the way they are. Also Spike doesn't help Buffy decide as he drives her crazy with his needs yet she hates him and wants him almost destroying her in the process. Once again it shows their relationship is going to get one of them killed or a mental break down.
I just wish it went further with the concept by having Xander as one of the orderlies or Spike as a fellow inmate with a violent streak to make sense of who these people are and why she pictures them the way they are. Also Spike doesn't help Buffy decide as he drives her crazy with his needs yet she hates him and wants him almost destroying her in the process. Once again it shows their relationship is going to get one of them killed or a mental break down.