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You fake a grin because your insides are screaming, people think you're a lunatic who’s always happy, you end up losing friends or getting new ones, but the more crap you get, the bigger your smile gets until you blow your top over something tiny.
My mom thinks I'm happy, but I'm just dying inside.
I smiled so much at work, I almost choked on my coffee.
He faked a laugh at my joke, then cried in the bathroom.