Go to a mirror and try out different smiles. Pick one that fits your demeanor when you are out on the town. I smile in my mirror every time before I go out, especially if I'm in a bad mood. The longer I hold my smile, the better I start to feel. It literally puts me in a good mood. Try it once or twice.
Reporter: What keeps you awake at night?
General James "Mad Dog" Mattis: Nothing, I keep other people awake at night.
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