The phrase saa hajimeyou is a common Japanese expression meaning let's begin, and its appeal online comes from that simple, forward-moving meaning rather than any single famous scene. Short voice clips like this travel easily between anime edits, gaming videos and short-form posts, where a two-second opener can set the tone before the main content starts. Because the delivery is energetic and the meaning is easy to grasp from context, creators keep reusing it as a clean, punchy way to signal that something is starting.