It is now possible to quantify people's levels of happiness pretty accurately by asking them by observation and by measuring electrical activity in the brain in degrees from terrible pain to sublime joy.
To play someone who is who they are because of the happiness and contentedness that they've known in their life is interesting because of sort of how banal it is.
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Oh I adored Mickey Mouse when I was a child. He was the emblem of happiness and funniness. You went to the movies then you saw two movies and a short. When Mickey Mouse came on the screen and there was his big head my sister said she had to hold onto me. I went berserk.