Just Who The Hell Do You Think I Am!?
One of the most popular lines from the anime Gurren Lagann. When using this line, you put on those W that go like this: \\/\\/, only longer. This is because the most popular character, Kamina, wore them every time he said it.
Guy 1: Do you want a sandwhich?
Guy2: Just who the Hell do you think I am!?
Guy 1:...I'm gonna take that as a no.
Guy2: Just who the Hell do you think I am!?
Guy 1:...I'm gonna take that as a no.