When the Villain Is More Interesting Than the Hero

In these movies, the villain and the hero share equal screen time* (even a little more for the hero) and yet the villain is the more interesting character: more colorful, more intense or more capable to elicit strong feelings from the audience.

What is your favorite movie where the bad guy is more memorable than the good guy?

After voting, you might discuss the list here

(*no movies where the protagonist is a bad guy or where the villain is some monstrous creature)