Yeah, not to pick nits, but the OP specified "iconic" rather than classic.
To me, iconic is a different tier of movies, a much smaller group, than "classic."
But I'm also not sure a movie has to be a classic to be iconic. Avatar, in many ways, should be considered an iconic movie. But I don't know if many would call it "classic."
Anyway just musing and splitting hairs. It's what I do.