You get Angry, Anger doesn't happen to you. If you don't like being angry, then why do you do it? So many people around us will do so many things that we do not like, we have no control over what's external to us. But within you, only what you want should happen... so why would you choose anger over joy?
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https://www.youtube.com/watch?v=hy5G0DN936Y
My mother demonstrates the fact that when people know they are being recorded, they usually feel the need to perform. She had no idea I was going to put it on the internet though...
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https://www.youtube.com/watch?v=1OhySFaMDtA