V for Vendetta

Evey Hammond: Who are you? 
V: Who? Who is but the form following the function of what, and what I am is a man in a mask. 
Evey Hammond: Well I can see that. 
V: Of course you can. I’m not questioning your powers of observation, I’m merely remarking upon the paradox of asking a masked man who he is. 

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Always question the obvious.