Who is Harold K. Bullard from Welcome to the Monkey House and what is their importance?

Harold K. Bullard is an old man who enjoys talking about himself and doesn't mind if no one wants to hear what he has to say. He sits next to the stranger, talks at him and ignores the stranger's complaints about Bullard's dog. He speaks loudly and clearly, for an audience. When the stranger starts telling his story, however, Harold is enraptured, and is a good listener, asking questions and exclaiming at the exciting moments. By telling his story, the stranger has effectively put Harold in his place.