It's happened to you many times before: your friend just seems down about everything, nothing's going right, and even the weather is dreary. You rack your brain trying to think of something to say, but words just don't come. Finally, you mutter something like, "I'm sure it will work out," or, "Just keep on smiling." Pathetic. Lame. And not remotely encouraging to your friend. So, what can you say to your friend? Should you possibly even do something?...