The anger that Uncle Junior has comes from my background. My father was the son of an Italian immigrant and I've seen the fire of the Italian temperament. It can be explosive sometimes in ways that are both funny and tragic.
A little anger is a good thing if it isn't on your own behalf if it's for others deserving of your anger your empathy.
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The quickest way to defuse fear or insecurity or anger is usually humor. I think comics figure that out quickly and once you figure it out you think 'Hey if I can do this and get paid that would be kind of cool.'