Talk to oneself, I think I have everyone on this topic. Being a voice actor I talk to myself all the time and yes I talk to myself in different voices at times. It is funny but it can calm you down while doing it. My poor wife thinks I'm crazy. I talk with one voice then with another voice. It can be on just about any topic, a script I am working on, etc.. Although it is what I call part of my training, it's always on going.
It's sounds strange, but try it. You'll find yourself laughing and theres nothing better than laughing at oneself. I always say, your nuts and well, I just talk again
I think you'll find yourself walking around with a smile. Because you'll think of what you are doing or did. Your friends or someone you know will say, Whats up? What else can you say but, Nothing just in a good mood and smile again and think, Man am I crazy, But your not.