"Might" nothing. To Kill A Mockingbird is wonderful. Period. (Fun fact: I believe it's Robert Duvall's first film.)Buck Wilde said:Classics? I'm not too sure about but I guess To Kill A Mockingbird might fit into that (obligated to recommend a Gregory Peck movie).
Also:
The 39 Steps (Alfred Hitchcock, 1935)
12 Angry Men (Sydney Lumet, 1957)
North By Northwest (Alfred Hitchcock, 1959)
The Manchurian Candidate (John Frankenheimer, 1962)
From Russia With Love (Terence Young, 1963)
Charade (Stanley Donen, 1963)
Dr Strangelove or: How I Learned to Stop Worrying and Love the Bomb (Stanley Kubrick, 1964)
A Clockwork Orange (Stanley Kubrick, 1971)
The Godfather (Francis Ford Coppola, 1972)
Chinatown (Roman Polanski, 1974)
The Godfather Part 2 (Francis Ford Coppola, 1974)
Taxi Driver (Martin Scorsese, 1976)
Alien (Ridley Scott, 1979)
Blade Runner (Ridley Scott, 1982)
Heat (Michael Mann, 1995)
Dark City (Alex Proyas, 1998)
π (Darren Aronofosky, 1998)
Collateral (Michael Mann, 2004)