I have a mess in my head sometimes and there's something very satisfying about putting it into words. Certainly it's not something that you're in charge of necessarily but writing about it putting it into your words can be a very powerful experience.
I've learned through experience of playing different characters some of whom were jerks that when you play a character who is pretentious or obnoxious in any way it's important to knock them down a peg.
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My worst hair experience was when I was trying to relax my hair and my grandmother did it. It went all straight and I looked like a black Bee Gee.