Well, depression works that way. Movies have given us a skewed idea of how it works, because there, when a character enters his “dark period,” it’s with a montage full of sad music and drinking and moping in dim rooms. Real life isn’t like that. Not only do moods fluctuate, but even when you’re at your lowest you find yourself in social situations where you’re not allowed to show it. If you’re in a dark place but can’t get out of your nephew’s birthday party at Chuck E. Cheese’s, you’re going to put on a smile for the camera. You feel selfish bringing everybody else down. You put on a cheerful mask.