The sympathetic nervous system can accelerate heart rate. Decreases the movement of the large intestine, constricts blood vessels. Can cause piloerection aka goosebumps and perspiration also known as sweating a lot of times.
If an example is what you need i'll try my best to help. Say for example, you're sitting in class and you're doing a group project and you want your best friend to do it with you but (s)he thought you had meant that you wanted to do it with someone else, because of poor body or facial language.
Does this help at all?...
