Okay, so because of all of this I hear about Jack Bauer vs. Buffy, I'm curious  out of these couples, and any other you can think of, who would win?  I don't just want physical fights, but matches of intelligence of wit, as well.

Buffy vs. River (Serenity)

The Winchester brothers of Supernatural vs. The Buffy gang (minus Buffy, of course, because Buffy could kill them)

Ninja vs. Pirate

Evil Dead zombies vs. Dawn of the Dead zombies vs. I am Legend zombies

Angel vs. Dracula

And any more you can think of.  Come on, let's have some fun with this one!