I usually start my fanfics with some song lyrics, so some of these 
may be recycled, but here are my contributions:

Aeka: "I will never forgive that woman!"
     Little Miss Can't Be Wrong, ???

Kasumi: (Any cluelessly-happy line) 
     Don't Worry, Be Happy, ???

Ryoko: "Time for today's lesson, schoolboy."
Hinako-sensei: "Now, boys, it's not nice to hit on your teacher."
     Hot For Teacher, Van Halen

Washuu: "I just need a few sperm samples."
     She Blinded Me With Science, Thomas Dolby
     Weird Science, Oingo Boingo

Bean Bandit: "Drag race through the heart of downtown?"
Speed Racer: "I want to be a professional racer!"
Racer X: "And I'm going to beat you, Speed."
Tamiya-sempai: "We're drag-racing heroes!"
     Black Sunshine, White Zombie
     Can't Drive 55, Sammy Hagaar
     The Distance, Cake
     Route 66, Depeche Mode

Azusa: "Charlotte! Gimme!"
     Caught Stealing, Jane's Addiction

Aeka: "Under no circumstance must Ryoko escape alive!"
Ryoko: "Ryo-oh-ki, this will be a fight to the death!"
     Love Is A Battlefield, Pat Benatar
     Keep 'Em Seperated, The Offspring

Quote from lovely, lethal female character of your choice
     Looks That Kill, Motley Crue

Quote from handsome, tough male character of your choice
     Bad To The Bone, G.T. & The Destroyers

Jinai: "I *loathe* you, Makoto Mizuhara!"
Ryouga: "I've endured unbearable torments chasing after you!"
     Unforgiven, Metallica

Kodachi: "You'll rue the day you crossed the Black Rose!"
     Painted Black, Rolling Stones

Shampoo: "Ranma! Ai-len!"
     Me So Horny, 2 Live Crew
(Come on, tell me the Viz dub doesn't sound like a high-pitched 
version of the streetwalker sampled for this song. :) ).

Shampoo: "Ranma! I kill!"
Puma sisters: "Give him another burst!"
     Kitten's Got Claws, Whitesnake

Lina Inverse: "Flare Arrow!" "Fireball!" "Dragon Slave!"
     Pyromania, Def Leppard


Hassheen!