I think what makes us human - is our interconnectedness among people. It's our ability to form and maintain relationships. It's the barometer by which we call ourselves human.
Sometimes, the smaller roles in movies can be the most interesting. If you only take the stance that you'll only play central characters in movies, you'll find yourself not being able to indulge in that morally grey terrain that makes support characters so rich and interesting.
Sometimes, when you have someone behind the counter who's supposed to assist you and help you out, just being completely bored and uninterested - sometimes it's a little bit frustrating, you know?