emotional person is scary!

    To be honest, i'm afraid of emotional person. they seem to own two characters of themselves in the same time. I have a friend. He is a great model of emotional person. He would smile to you, joke to you and having fun with you. And, all of a sudden, he would show u anger! This is DAMN fucking scary. what should i respond?


    Why do these people exist?? Is it normal to have people like that in the world? He could be very friendly, could be very fierce and emotional. I would like to reveal secret in it.  Scary!!!~~~