The ultimate villainous transition! Willow has gone dark a few times over the course of Buffy The Vampire Slayer, but the best was when the characters were shown the alternate timeline where Willow was actually a vampire! Willow is the ultimate in geek sheep, with her sweaters, overalls and mostly bland apparel. Her vampire alter ego on the other hand seems to be a fan of corsets in shades of red and black. I don't think we need to go too much into detail on what the difference in costuming represents.
Cordelia: You'll be okay here. If you hang with me and mine, you'll be accepted in no time. Of course, we do have to test your coolness factor. You're from L.A., so you can skip the written. So let's see...vamp nail polish? Buffy: Over? Cordelia: So over. James Spader? Buffy: He needs to call me! Cordelia: Frappachinos? Buffy: Trendy but tasty. Cordelia: Josh Tesh. Buffy: The devil. Cordelia: That was pretty much a gimme, but you passed!
Joyce: Okay, have a good time! I know you're going to make friends right away, just think positive. [Buffy leaves the car] Joyce: And honey... [Buffy turns around] Joyce: Try not to get kicked out. Buffy: I promise.