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Scavengers is a British cinema PIF shown before 18 rated movies in 1987. The ad is from a charity known as LYNX, attempting to stop animal fur trading. This ad takes things up a notch and has been considered by many people to be the most scariest PIF/PSA ever due to its pure, unadulterated squick.
(Graphic description warning)
The ad starts off in a fly's point of view, hovering and buzzing over a city, as ominous music plays. The ad then cuts to a woman exiting a car and entering a building with a fur coat in hand. Meanwhile, the flies manage to enter the building and set their sights on a fur coat on a mannequin. After a couple of metaphors comparing the flies and the humans to using fur, the woman finally notices something suspicious about that mannequin. She and a man she met walk over to it as the weird sound effects in the back increase in volume.
As soon as the woman pulls the mannequin's fur coat off, a series of fast close-ups of the flies and maggots taking refuge in the mannequin appear, revealed to be a really graphic and gory animal carcass with a still-beating heart, which ends up falling to the floor. The disturbing scene is accompanied by loud, sythesized, echoing screams. The ad ends with this message: "When animals are killed for fur, two kinds of scavengers move in. The difference is, the flies don't know any better."
WARNING: Contains extremely graphic content. Please do not watch it if you're under the age of 18 (hence the BBFC 18 age rating).