1 Head Death: THIS IS TRICKY. HISTORY RECORDS THAT YOU DIED IN THE REICHSTAG FIRE IN FEBRUARY 1933, HERR HITLER.
2 Hitler's Brain: I sneer at you!
3 Head Death: YOU CAN'T SNEER AT ME. YOU HAVE NO FACIAL EXPRESSION.
4 Hitler's Brain: Then... Nazi science sneers at you!

Yes folks, you wondered where this expression came from. Now you know!

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2016-05-30 Rerun commentary: And we've gone back away from the cameraman's video point of view.

Normally the "camera" in a fictional video or comic scene is invisible, in the sense that the characters in the story have no idea that they are being captured for representation to an out-of-universe "viewer" of their story. When filming movies or TV shows, the director and camera operators take pains to ensure that artefacts of the cameras, such as shadows or reflections, are not visible in the scene.

Here, however, we can see the shadow of the camera on the lower left of the first panel!