Walter has a fear of enclosed spaces. He sweats profusely, shakes and becomes highly agitated whenever he thinks about enclosed spaces, and he avoids them at all cost, even if it means he will not be able to do something or go someplace. His friend Peter does not like enclosed spaces either; however, Peter will not avoid doing things that require him to be closed off or in a small space. The difference between Walter's reaction and Peter's reaction is that Walter's reaction: