Cool song. Creepy depressing video.
I'll look through the few Natalie movies I have for the proper word. Would be funny if she said "no plot". ;)
Also, since they are outside, you could lay in a lot of annoying traffic sounds. Horn honking, angry drivers yelling and cursing, and some Jetsons car sounds? I think there's a traffic jam or two in Futurama?
JEDIT: Maybe she could say "you'll always be my little slave"?