Dr. William Stewart Halstead: [Addresses bedraggled colleagues] It is my considered opinion that cocaine is a habit-forming drug. Recall the past four or five weekends. Why have they been so depressing? Why? All week long, we feel fine. Then the weekends come along, Saturday and Sunday. We feel low, depressed - can't wait until we get back to work. There's not one of us who has any interest that lies outside of this room. Why? It's not the work that's driving us any more - it's the drug. We proved one thing more about cocaine than we intended. It's a drug of addiction. And gentlemen, we have become addicts!