The thud is Netflix's official sonic logo, the ta-dum that plays at the start of its original films and series. Introduced in 2015, it was designed to give streaming the same cinematic opening as a studio logo in a cinema, and it quickly became one of the most recognised sounds in entertainment. As Netflix grew worldwide, creators began lifting the clip for parodies, reaction videos and fake trailers, using it as shorthand for a big premiere. Its familiarity keeps it useful today, instantly telling viewers that something worth watching is about to start.