My wife gauges my level of happiness by the twinkle in my eye. I love how she giggles with excitement when she sees it; I hate when she points out it’s absence. Either way, there exists a state of mind which manifests itself physically. We feel it inside, but they see it outside. And they see it clearly.
So, do you still think you can fake it? Anyone who cares enough to look carefully will see the truth…even if you don’t know the truth yourself.
Be mindful of the twinkle. It will almost always give you away.