The exact source of this particular clip is unclear, but its style fits the wider internet habit of using “sus” audio to label something questionable or obviously off. The term “sus” became mainstream through online slang and exploded further with Among Us in 2020, where players constantly called each other suspicious. Since then, editors across short-form video platforms have used custom intro sounds like this one to open bits, foreshadow sketchy behavior, or parody dramatic reveals. Its staying power comes from how quickly it signals the joke.