The gift can also be surplus labor made in excess of the labor necessary from the worker, created not for other fans but rather to compel the original media property to notice their indebtedness and do something for the fans in return.[17] These gifts are like offerings made to show the original producers that there is a lively fandom for their product, and possibly encourage the producers to make more. This was the case with the fans of the Firefly TV series, who engaged in very visible fan activities, such as charity events, “guerrilla marketing” activities, creation of fan videos, and filk in order to successfully convince a studio to green-light a movie sequel to the canceled TV series.[18]