When people are stimulated by an exciting soccer match, their excitement can fuel and intensify anger. this effect is known as: ?

The correct answer is the spillover effect. 

The spillover effect (SOE) refers to the phenomenon in which our emotional responses or reactions to one particular event or situation "spills over" and influences our emotional responses to another event. An instance of SOE, is when you come home from a run and are already feeling good because of endorphins. Next, you receive some good news from a friend, and the good feelings from the run, spill over and make you feel the same about your friend's news.