One of the most influential things would be? The atmosphere. According to psychological theory, one half of our brain deals with affection, which concerns with feelings and emotions. At times, when one quiets down, others follow. We have dealt with several similar situations where feelings in the atmosphere are contagious, which may somehow influence everyone involved. And of course, the strength of the emotions too plays an important role in determining the last which stands. The stronger it is, the higher chance it might affect the people around.