It is an important component of the Monolithic and Caricature fallacies discussed below. A syllogism has only three terms. All cats are mammals. Therefore, all snakes are mammals. This error also often enters into formation of caricatures.
Some men are Greek.
Therefore, all mortals are Greek. This example is not as far-fetched as it appears. All men are mortal. Some men are Greek. Therefore, all Greeks are men.