1 Jamie: We jump together, on the count of three, okay?
1 Adam: Okay.
2 Jamie: 1... 2... 3... {Adam jumps}
3 Jamie: Go! {Jamie jumps}
4 {blackness of the inside of the hole}
4 Jamie: I always thought it was "1, 2, 3, go," not go on "3".
4 Adam: Aha! Busted!

It's an eternal question. When someone says "on the count of three", do you go on "3" or do you wait for the "go" after the "3"? Each version has its proponents, and never the twain shall meet.

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2018-10-04 Rerun commentary: I'm trying to remember how I did the effect of them jumping in mid-air.

I just checked the original Photoshop file to see if it has layers showing how I composited the image, but it's all flattened into a single layer, alas. I'm guessing I posed the figures like that, standing them on some easy to cut out background like a green screen or something, and then pasted them in to a blank shot of the Infinite Featureless Plane of Death.

In fact... looking closely I can see a green tinge on the back of Jamie's head and right hand, which is probably reflected green light off a background prior to being cut out. Whereas in contrast in panels 1 and 2 the same areas are reddish.