This Halloween III: Season of the Witch t-shirt features the logo for Silver Shamrock Novelties, the evil organization that made sacrificial masks for children. In Halloween III, Conal Cochran started Silver Shamrock Novelties and manufactured masks with microchips inside. When the Silver Shamrock commercial played on television, it sent off a signal that activated the microchip and killed the children. The masks would then unleash snakes and insects that would kill anyone near the children's bodies. Happy Halloween! For any fan of Halloween III: Season of the Witch, this Silver Shamrock Novelties t-shirt is a must have!