Minsa'y Isang Gamu-gamo

Set in 1969, the film tells the intertwined stories of a couple and their families, both of a lower-middle-class background, living near Clark Air Base in Pampanga.

Corazon de la Cruz is a nurse who plans to go to the United States as a trainee. She hopes to one day get a green card that would allow her to stay in the United States, gain immigrant status, and eventually bring her family there so they can lead a better life. Corazon's mother, Chedeng, and younger brother, Carlito, encourage her. However, her grandfather, Inkong Menciong is critical of her plans, saying that it is a betrayal of their country.

Meanwhile, Bonifacio Santos intends to join the United States Navy so that he can follow his girlfriend, Corazon, to the United States. His mother, Yolanda, a worker in the American Base commissary, attempts to help however she can.

The young couple's dreams begin to break down after Yolanda is wrongfully accused of theft, strip-searched, and humiliated by a Filipino merchandise officer working at the Base. Bonifacio convinces his mother to file charges of "slander by deed" against the officer, and their lawyer files a letter of protest against the American base commander. In response, the merchandise officer, accompanied by two American service personnel, raid Yolanda's store and confiscate all of her merchandise. The goods are eventually returned, but a case against the Base personnel for conducting the illegal raid cannot prosper due to a lack of jurisdiction. A disillusioned Bonifacio no longer wishes to join the US navy.

On the night of Corazon's farewell party, Carlito is shot dead by a serviceman while flying a red, blue, and white kite near the Base. A group of American officers attend the funeral and offer a donation to the de la Cruz family, adding that the serviceman had thought Carlito was a wild boar. An outraged Corazon yells back at them, "Ang kapatid ko ay hindi baboy! (My brother is not a pig!)" During the funeral procession, Inkong's memory of World War II is triggered and the film cuts to historical footage of the Bataan Death March.

The de la Cruz family file a criminal case against the American serviceman. During the hearing, the lawyer representing the American base notifies the court that there is lack of jurisdiction as the corporal responsible for Carlito's death had returned to the United States upon the termination of his tour of duty. The judge dismisses the case. Walking down the steps of the courthouse, the base lawyer attempts to give Corazon an envelope filled with dollars from the corporal, reiterating that he thought her brother was a wild boar. Corazon shows the lawyer a photo of her brother and pushes the envelope back to him.

A motorcycle accident occurs outside the courthouse. Corazon's lawyer pushes through the crowd exclaiming that there is a nurse. The motorcycle driver's helmet is removed and it is revealed to be a white man. The film closes with a shot of Corazon looking down at the victim.

The film has been described by film historian Jose Capino as belonging to the "cinema of decolonization" along with Lino Brocka's PX and Augusto Buenaventura's Sa Kuko ng Agila, all explicitly addressing the issue of the American military presence in the Philippines during the Bases era, as the 1970s saw growing political and legal debates over Philippine sovereignty and the American bases. In the film, Philippine sovereignty is both literally and metaphorically compromised.[10]

In particular, towards the end of the film, Corazon de la Cruz struggles to perform the traditional tinikling dance during her farewell party, and the scene is juxtaposed with her brother flying a red, blue, and white kite (the colors of both the American and the Philippine flag) over Crow Valley near Clark Air Base. At the point where Corazon errs in the tinikling, her leg caught between the bamboo poles, the film cuts to Carlito falling after being shot by an American officer. According to Capino, the film "marks the impossibility–at least during its historical moment–of parity between ex-colonizer and ex-colonized." Carlito dies when his family is busy celebrating Corazon's departure for the United States, so the "juxtaposition of the tinikling and kite scenes forms a rather pedantic image of cultural conflict."[11] After Carlito's death, Inkong Menciong burns the kite, recalling the laws against flag burning during the American colonial period.[12]

There is a parallelism between Carlito and the spit-roasted pig served at the farewell party of Corazon, foreshadowed in the film when Carlito and Inkong watch the pig's slaughter before the party. The defense given by the American personnel is that the shooter mistook Carlito for a wild boar. In response, Corazon asserts the film's famous line: "Ang kapatid ko ay hindi baboy! (My brother is not a pig!)"[13]

The film makes several historical allusions, including Inkong's memory of the Bataan Death March;[12] the Vietnam War, with Clark Air Base used as a refueling station;[14] and the 1969 moon landing, with Inkong asking, "Corazon, do they [the Americans] also own the moon now?"[12]

The film premiered on December 25, 1976, as an entry for the 2nd Metro Manila Film Festival.

The film received mixed reviews. Nicanor Tiongson, writing for The Philippine Daily Express, praised Nora Aunor's performance and concluded by stating, "flaws notwithstanding, the film stands as one of the best in 1976 Filipino Film Festival and in the year 1976 as well not only because the story and screenplay, and most of all, the point of view of the movie are unequivocally and passionately Filipino."[16]

In 2022, following the recognition of Nora Aunor as a National Artist of the Philippines, Filipino film critic-archivist Jojo Devera wrote that Minsa'y Isang Gamu-Gamo "features what still remains Aunor's most complex film performance" and that her "moving treatment of the material is some of the finest screen time she has ever occupied."[17]

In 1991, the Philippine Educational Theater Association (PETA) staged an adaptation of the film. The stage play also starred Nora Aunor, reprising her role, in her first appearance on stage. The adaptation was written by Rodolfo Vera and directed by Soxy Tapacio. It premiered at the Raha Sulayman Theater in Fort Santiago. The source material was chosen as that year Philippine senators moved to vote against renewing the Military Bases Agreement, effectively removing the presence of the United States military in the country for the time being.[18]

• Minsa'y Isang Gamu-gamo at IMDb
• Minsa'y Isang Gamu-gamo at the British Film Institute