The 'What?!' chant began in 2001, when Stone Cold Steve Austin — then WWE's top villain — started barking 'What?!' after his own sentences in promos to mock fans who were heckling him. The crowd turned the insult back on him, and within weeks entire arenas were chanting it between his lines. The gag stuck: two decades later the chant still erupts at WWE shows whenever a wrestler pauses mid-sentence. Online it escaped wrestling entirely, becoming a universal reaction clip for disbelief, and it now lives on in memes, streams and reaction videos.