Crying, of course, is not only seen with grief, sadness and agony. Here, Amanda Knox cries tears of Joy and Relief - at the overturning of her previous murder and other convictions. It's surprising how often this type of crying is misinterpreted as sadness - a reminder of the need to constantly be looking for several body language signals occurring simultaneously or in a very short period of time. This is know as a "cluster". When three or more signals in a cluster are congruent for an emotion or emotions - body language accuracy is extremely high. As you get better at nonverbal communication, you will become skilled at seeing groups of expressions and gestures at a glance, where many (falsely) think themselves astute if they see but one.