As corny as it sounds, smiling and laughing really does make you feel better. If you are down in the dumps, put on a funny clip on YouTube. Just search for your favorite TV shows, comedians, or anything else that you know puts you in a good mood. One video might not do the trick, so keep going until you actually start to smile and laugh. We live in an amazing time when we can get any kind of entrainment on-demand. So you might as well take advantage of it.