We've been trained since kindergarten: Be nice be kind share put on a smile. So we're conditioned to squash our natural selfish instincts and that's the right thing for society.
You can always tell folks from nonfolks. Folks like to feel good like to smile for the camera when there's a big photo opportunity for a really good cause.
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When onstage I always try to take my audience through as many emotions as I possibly can. I want them to go from laughter to tears be shocked and surprised and walk out the door with a renewed sense of themselves – and maybe a smile.