He does not do a very good job, so Bart decides to scare an alternative lunch out of his friends by making up a story about a cannibal cafeteria worker named Dark Stanley, who killed all the students in the cafeteria and put them in his kids' head soup and was eventually hanged for his crimes.
He fails miserably, so Bart concocts a tale about Dark Stanley, a cannibal cafeteria employee who slaughtered the students and served them in his children's soup, leading to his execution by hanging.