Happy, happy Halloween. Silver Shamrock. This Halloween III: Season of the Witch t-shirt shows the iconic logo for Silver Shamrock Novelties. Silver Shamrock Novelties made jack-o-lantern, skull and witch Halloween masks, which included microchips that were activated by a signal in the Silver Shamrock commercial. When the microchips were activated, they would kill the children who were wearing the masks. Silver Shamrock was the evil organization in one of the most underrated horror movies of all time! Wear your Silver Shamrock Logo t-shirt and watch the magic pumpkin!