Dog clickers grew out of animal training based on reward marking, where a distinct sound tells an animal instantly that it has done the right thing. The method spread from professional trainers to everyday pet owners, and short click clips later became a staple in training videos and social posts. Online, the same snap is reused for jokes about obedience, loyalty and Pavlovian conditioning, because listeners immediately recognise it as a reward signal. That instant recognition is why the one-second click still works in edits today.