Humor is a tool which can be used to create a reaction. It can be used to manipulate or hurt someone else or used to make someone laugh. When used positively, humor can be used to bring light to a situation, to make things easier, or to show appreciation. It can bring people together and bridge gaps. When used negatively, however, humor can be used to make someone feel embarrassed, self-conscious or even uncomfortable. The decision to use humor as a weapon or a tool is up to the person using it.