Conversation is something not to be missed in our daily life, anytime & anywhere.
One's conversation will come in many different emotions; example when you are feeling angry, sometimes the sentences that comes out wouldn't be pleasant to the ear.
But have you ever thought about it, how you react affects the other party's feelings too.. or do you only realise it later.
Maybe humans are just too immune to this "conversation" that they wouldn't pay attention to such detail. or maybe it's just too natural to express their feelings first follow by the details.

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