"YOU JACKASS!!" - Ukyo from Ranma 1/2 [I really like this one's dub]
"keh..." - Inu Yasha
"Would please bear my child?" - Miroku from Inu Yasha
"Haaiiiiiyyyyyyyaaaaa" - Shampoo from Ranma 1/2
Let's not forget... "Saiyu sen Jiko Yo!!" (This is a priority one!) - all the alien babes from Please Teacher...

Most anime characters have that little "phrase" that either ticks you off or makes you laugh or just gives you that "fingerprint" that "yep, that's da one..." What do your favorite anime characters say over and over again that you hate/love to hear? ^_^