...but before we do, we'd like to point out that during our research we realized there are many a great characters that do not really get a last line. The final thing they say may be a scene or 2 before the actual death or some-such. This includes: Anya, Buffy (the 1st time), Kendra (she's hypnotized), Jenny Calendar, Larry, Jonathan, Joyce, etc. Since they didn't get the glory of a last lick, why not make one up for them and leave it in the comments?
Without further ado, Buffyfest presents: Last Lines of the Dead.
-BtVS-
Jesse: - "You don't have the guts." - The Harvest
Principal Flutie: - "Are you insane?!" - The Pack
Darla: "Angel?" - Angel
Uncle Enyos: "I suppose you want answers." - Innocence
Angel (Becoming): "Quickly, you have to send me to Hell to stop Acathla, Buffy" (reportedly, all but the last word were "indicated with his eyes" [sic]). - Becoming Part 2
Mr. Trick: "Oh, no. No, this is no good at all." - Consequences
The Mayor: "Well, gosh." - Graduation Day Part 2
Magie Walsh: "Adam?" - The I in Team
Adam: "How...can you?" - Primeval
Buffy: "The hardest thing in this world is to live in it" - The Gift
Tara: "Your shirt..." - Seeing Red
Spike: "I want to see how it ends." - Chosen
Warren: "I know you're in pain, but-" - Villains
VampWillow: "Aw, f..." Doppelgangland-Angel-
Doyle: " "Too bad we'll never know...if this is a face you could learn to love." - Hero
Lilah: "He's gonna kill us." - Calvary
Cordy: "Oh... and you're welcome." - You're Welcome
Darla (again): ""This Child, it's the one good thing we ever did together. You make sure to tell him that." - Dad
Fred: "Please, Wesley, why can't I stay?" - A Hole in the World
Wes: "I—I love you." - Not Fade Away
Lindsey: "You kill me? A flunky?! I'm not just... Angel...kills me. You don't... Angel..." - Not Fade Away-Firefly-
Mr. Universe: "They can't stop the signal, Mal. They can never stop the signal." - Serenity
Wash: "I'm a leaf on the wind. Watch how..." - Serenity
Shepherd Book: "I don't care what you believe. Just believe it. Whatever you..." - Serenity-Dr. Horrible-
Penny: "Captain Hammer will save us." - Dr. Horrible Act III