My fave episode is 'Hush', it's just sooooo creepy! I also love the Spike episodes, I can't recall their names, but there is one in season 5 and one in season 7...I think the season seven one is called 'Lies My Parents Told Me'...very dark...the season five episode is the one where Spike tells Buffy about the slayers that he has killed including the one in the subway in the 1970's... cool!