 Several idioms related to pigs have entered the English language, often with negative connotations of dirt, greed, or the monopolisation of resources, as in "road hog" or "server hog".As the scholar Richard Horwitz puts it, people all over the world have made pigs stand for "extremes of human joy or fear, celebration, ridicule, and repulsion".Pig names are used as epithets for negative human attributes, especially greed, gluttony, and uncleanliness, and these ascribed attributes have often led to critical comparisons between pigs and humans.