Watch 123Movies. Memento Mori is a techno-horror short film about Silas, a man in his thirties who works as a content moderator. His job pushes him to the brink as he repeatedly wades through extremely violent and sexually explicit videos and imagery. These repeated viewings cause him to obsess over his mortal and corporeal self, spiraling him into mind-bending departures from reality. His existential concerns are compounded only further as he grieves the death of his father and a past that continues to haunt him.