The human brain is a prediction machine. It constantly compares what is coming in with what it expects. When reality matches expectation, the brain registers this as neutral — not memorable.
That is the principle of the Ah reaction: a micro-moment of cognitive surprise that locks in attention and increases the chance the message will be remembered. Surprise does not have to be spectacular — it can be an unexpected cut, a sudden silence, a camera perspective no one expects.
In a world full of content, every video competes for attention. Those who surprise, win that attention. Those who confirm what the viewer already expects, disappear into the background.