This sound comes from the opening vocal of “Chop Suey!” by System of a Down, released in 2001 on the album Toxicity. The brief “Wake up” line became especially popular online because it is immediate, dramatic and easy to recognize in less than a second. Short versions spread through meme edits, reaction videos and wake-up jokes, where creators use the clip as a fast interruption or exaggerated cue for panic, surprise or chaos.