Fred failed to show up for a date he had made with Penni. Penni, who was angered by Fred's actions, decided to vent her andger by cutting the tires of Fred's automobile. However, Penni did not know what make of automobile Fred drove and mistakenly cut the tires of a car owned by Fred's neighbor, Stacey. Penni is now charged with the "purposeful destruction of personal property." Penni claims that her act was not purposeful because she did not intend to cut the tires of Stacey's car. Discuss this defense.