Season 4 of this animated sitcom about the goings-on at a family-run hamburger joint is still cooking up plenty of fun. Among the highlights: Bob took a part-time job at a second-rate frat house, where he hits it off big-time with the fraternity brothers; and Linda, haunted by a poor talent-show performance from her high-school days, decides to get back together with her former bandmates to rock their class reunion.