Both Xanders: Kill us both, Spock.
This is a reference which can come from two Star Trek episodes. One is "The Enemy Within", wherein Kirk is split in two, one being his aggressive side, the other his wimpy side. The meek Kirk suggests to Spock that if they cannot be rejoined, he must kill them both. It is also a paraphrase from a quote in the episode "Whom Gods Destroy" where the insane Captain Garth, shape-shifts into Captain Kirk. When Spock cannot tell them apart the real Kirk yells "Shoot us both, Spock!" Spock being, of course, the human/Vulcan, from the original Star Trek TV series.