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Listening to music and cry, cooking a turkey and laughing( it was a living creature one day).
If we take this two situations, and eliminate some other variables, we can deduct that this person is schizophrenic, because his reflections are conflicting, sometimes he expresses sadness, sometimes he expresses joy, though in this two situations we expect him to express sadness.
If you ever noticed something like this in you, don't be ashamed, it completely normal, but it doesn't mean you're in good psychological health.