Geometria is a 1987 short fantasy horror comedy film written and directed by Guillermo del Toro.
It is the tenth short film del Toro directed, though all but 1985's Doña Lupe remain unreleased.
Del Toro was not satisfied with the original cut of the film, and said that he was not able to finish it the way he wanted to at the time.
He summons a demon to fulfill his wishes, in hopes of both passing the exams and of resurrecting his father.
A Mexican widow (Guadalupe del Toro) receives a letter from the high school attended by her son (Fernando Garcia Marin).
In a dark room, he reads from a tome of sorcery, which states, "As a protection for the invocation of a major demon, place yourself inside a pentagon drawn with your own blood.
Francisco kills and eats his wife, while their son looks on in horror, unable to step out of the pentagon for fear of losing its magical protection.
Bloody Disgusting said, "Geometria makes for an inspiring short from a filmmaking standpoint, as well as a humorous piece of gruesome horror for the casual fan.