Family Guy

Peter decides to grow a moustache, but then he's mistaken for a fireman, so he lends a hand when a fire breaks out at a local fast food restaurant. The owner gives him unlimited burgers as a "thank you" but he eats so many that he eventually has a stroke. When Peter recovers, he vows to expose the fast-food company and becomes friends with a genetically engineered cow he meets after infiltrating the McBurgertown warehouse.