Sometimes if you are not well networked "any job" isn't as easy as you think. If Dot's diner thinks he is overqualified, then they do not want to go thru the rigamarole of hiring him, just for him to leave in 3-4 weeks when he finds a better job, they might hire you on a short term basis if you have a friend there (or in management) but they dont want to hire someone they think will leave soonish.