The best way to learn about films, in my experience, is to watch a lot of films. Duh, I know. But every film you watch teaches you how to watch the next. One of the good things about double features is that watching films together can illuminate both, each teaching you how to watch its partner. Here are five pairings that clarify genre focus, help to situate each other in history and otherwise enrich each other, both as films and as guides to future films.