Aliens come to Earth. You were chosen to talk to them. They want to know our civizilation but only with ONE movie. Which one would you pick?

Imagine Aliens come to Earth. You are chosen to go and talk to them.

They are pretty nice with you. They want to know our civizilation and way of living.

But there's a catch. They're leaving soon. They know movies are popular around us. They ask you which movie can they see to understand us.

Which one would you pick?