ORE WO DARE DA TO OTTOME YAGARU?!?!
No seriously, I have always said "Who the hell do you think I am?" since like, 6th grade. Escpecially to teachers and or people trying to pull one over on me.
"Hey, do you see that dragon over there?"
"WHO THE HELL do you think I am? I am not that stupid."
LOLOL
EDIT: Also, I say "Yeah. Ok." A lot. As in, Yeah right.