A smile means a retention of control. Forced lucidity.
A smile is a cultured sneer.
A smile is a paradoxical reflex when the mind shatters.
A smile disarms other predators and attracts prey.
A smile reassures them: "It's okay, I'm still having fun."
A smile is a snarling warning.
A smile mechanically fools the brain into releasing healing endorphins.
A smile grins blindly through the scorching pain.
A smile is the finishing touch so the stage make-up glimmers.

A smile says "Everything will be fine soon."