I think it's everlasting hysteria from The Prom. I was a gibbering wreck at the end of it.
Faith's arc is particularly compelling, and I love the 'The Wish' universe. The whole graduation arc at the end had me enthralled also. I suppose that Angel's purpose pretty much dwindles though, which is a shame after season two. However, he got his own series, so it was all good in the end.