The entire series of Gurren Lagann, obviously.
"I'll take a potato chip, and eat it!!"~Death Note
Yusuke: What are we waiting for?
Hiei: You to stop talking.~Yu Yu Hakusho
"The only ones who should kill are those who are prepared to be killed."~Code Geass
This entire scene from One Piece:
http://www.youtube.com/watch?v=ydrztH0mzVQ
"A mulberry is a tree, and Kuwabara is a man. We all have to face death someday, but if we do our duty, we'll have no regrets."~Yu Yu Hakusho
"Cause I'm Kuwabara, and in case you forgot, I have a sword!!"~Yu Yu Hakusho
"Listen, CC, I have a new house in Australia. A clean, perfect, immaculate house, where we'll live together. But to get to Australia, you have to fly a plane, and you're much too big to take on a plane. (whips out chainsaw) So I'm gonna make you compact!!"~Code Geass
"Soldiers take orders. Not me."~Yu Yu Hakusho
"Excuse me has anyone seen my arm? You can't miss it, it's bright green!"~DBZ (I facepalmed when I heard that line for the first time)
"Pirates are evil? The Marines are righteous? These terms have always changed throughout the course of history! Kids who have never seen peace and kids who have never seen war have different values! Those who stand at the top determine what's wrong and what's right! This very place is neutral ground! Justice will prevail, you say? But of course it will! Whoever wins this war becomes justice!"~One Piece