Brainley and his alternate from another dimension are talking.

Alternate Brainley: Well, I should head back to my own reality. Lord only knows what sort of mess McMoosington has gotten into with my jello cannon.

Brainley: Before you go, there was one thing I was hoping you could help out with...

Cut to shot of a large exhibition hall adorned with a banner reading "SCIENCE EXPO". Brainley and Alternate Brainley stand on stage, watched by two walruses. One is wearing flimsy 3d glasses, and the other is holding another pair of 3d glasses and looking at them skeptically through a monocle.

Brainley and Alternate Brainley (in unison): And so, as you can see, these glasses allow the wearer to see in double vision.

Skeptical Walrus: My word! But why does only one of you have a mustache?

Brainley: Er...speck of dust on the lens.