How is it that no one has yet mentioned "In the name of the moon, I will punish you!"?
My favorite line is still probably from Puni Puni Poemy, when Nabeshin, Poemy's father, returns from the dead.
Poemy: Hey, the director's alive!
Nabeshin: Oh, sure, a normal director would have died, but I'm not a normal director! I'm J.D.W., the great director Watanabe!
Poemy; That still doesn't make much sense...
Nabeshin: Hey, I'm the director, fuck off!
From Panty and Stocking With Garterbelt
"Repent!"
... and pretty much every second of that show is gold.