I love the many funny posts of DaveyJones in this thread, but I want to comment on this one:

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Who knows, perhaps one day everyone will be shown to be abnormal...thus confirming what we already know!

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By definition, we'd all be normal, then!

All emotions are controlled by brain chemicals, so it's very easy to define anything as a disorder. I'm not sure if anyone knows exactly what is the proper level of all brain chemicals, and it might be different from person to person.