Jun 17, · Surprise has also been categorized into being valent, which means that it spans the spectrum of being neutral, pleasant, and unpleasant. Surprise is characterized by a facial expression that causes someone to arch their brows, open their eyes widely, and drop their jaw. 6. Facial expressions can explain a lot about what's going on in one's mind. As humans, we are able to express our emotions through our words as well as actions. Our body language sometimes becomes a dead giveaway to the real emotions .