This is hidden brain.
I'm Shankar Vedantam.
We all love a good surprise in movies.
We love the moment when the rug is pulled out from under us, when everything we thought we knew turns out to be totally wrong.
We love these moments so much, we even get a kick out of watching other people being surprised.
What?
My God.
What?
Oh.
What?
What?
In fact, there's an entire mini genre on YouTube of parents filming their children listen as they watch one of the greatest surprise scenes in movie history.
Spoiler alert.
This is the showdown between arch rivals Darth Vader and Luke Skywalker in Star wars the Empire strikes back.
Obi Wan never told you what happened to your father.
Video after video shows cute little kids peeking out from under blankets, their eyes wide, as they discover the secret that the rest of the world already knows.
I am your father.
What?
Dad.
Vader is his father.