What is your favorite episode of Buffy from all of the seasons?

Mine is Grave, the last of the 6th season. It's so sad at the end!! (When Xander saves the world)

Mine is Something Blue, on the 4th season, when Willow's boyfriend, Oz, leaves her and she freaks out, but no one can listen to her because they all have their own lives. So, she does a spell that makes what ever she says comes true. Some of the things she says are:
"If Buffy loves Spike so much why doesn't she just marry him!" (engagment)
"No, Giles you can't see anything!" (blind)
"Xander, you're just a demon magnet!" (attracts all demons)

Thats Hard, probably This Years Girl, when Faith awakens from her coma, i have most of the 4th season on video. *wishes for a video player*

I would have to say its the last epiosode of Season 5.
Sad but full of action n intensity