10. 'Angel' (Season 1, Episode 7)
Everyone's favorite brooding bloodsucker Angel graduates from morose, older-guy crush to potential object of epic romance in one of the show's key star-crossed-lovers episodes. He' s a vampire, she' s a slayer – how ever will they make it work? The chemistry between Gellar and David Boreanaz is scorching, the character are more doomed than Romeo and Juliet, and Buffy puts its first major piece of mythology in place. "Love makes you do the wacky."