Superman/Batman #63 was your standard MOTW standalone issue, with a twist in the end: it turns out it was all a simulation run by Batman.
Let’s take a closer look at his folder:

Apparently “World’s Finest” were all just Batman’s simulations. The fact that Batman apparently plays his homemade Sims is hilariously adorable in itself, but the selection on his screen is just making me cackle.
WORK FILE CODE #WF71 - TAG ‘DOUBLE’
After seventy issues of World’s Finest being separate Superman and Batman and Robin stories published in one book with them only interacting on the covers (which were… something else), issue #71 was the first one to finally feature a team up, “Batman’s desperate and breathtaking effort to protect the Man of Steel”… from Lois discovering Superman’s secret identity.

WORK FILE CODE #WF128 - TAG ‘TRANSFORMED’
World’s Finest #128 was one of those baffling, bizarre Silver Age stories where Batman is hit with a ~plot device~ and transforms into stuff. Including a buzz saw. Yes, this is Bruce’s imagination: he’s preparing for the eventuality of turning into a buzz saw. Or just fantasizing about Superman holding him while he vibrates, IDK.

WORK FILE CODE #WF215 - TAG ‘SUPER SONS’
If you’ve been reading my blog, you’re very familiar with Clark Jr. and Bruce Jr., their groovy asshole sons. World’s Finest #215 was their first appearance.

WORK FILE CODE #WF289 - TAG ‘THE KRYLL WAY OF DYING’
The (in)famous World’s Finest #289. Is something Batman came up with. That’s just amazing.
I posted panels from this issue many times, but the plot is so incredible that I have to summarize it to convince myself once again that it happened. Mind you, I’m not exaggerating here AT ALL, just retelling the issue:
So! Superman is feeling down, and since he’s so attuned to Batman’s feelings, he senses that his friend isn’t in high spirits either, so he drops by the Cave to invite Batman for a sleepover at the Fortress “to share their burden”. When they arrive, they talk, the panel below happens, and then they proceed to stand like that for some time, looking at each other with “naked feelings”. Then! A meteor crashes near the Fortress and it turns out to be full of tentacle aliens who feed on human emotion. The tentacle aliens had been drawn to them BY THE INTENSITY OF THEIR FEELINGS, and after communicating that to Superman and Batman, they proceed to mate. Batman and Superman just stand there and watch tentacles have sex with other tentacles. When they’re done, the tentacle aliens decide to die because the only way for them to live would be to drain the whole Earth of emotions. Superman and Batman are extremely touched by this, and I quote: “Glowing with the returned auras of emotion, the two men weep… then turn and embrace over the ashes of feeling, the dust of the sacrifice. Here it is warm… outside it’s bitterly cold. Perhaps on one else, on any world, would understand. End.”
And in-universe, this is a thing that Batman wrote. That came from Batman’s head.

WORK FILE CODE #WF11100 - TAG ‘TERRY’
This obviously has something to do with Terry McGinnis, but I can’t think of anything specific those numbers could be referring to. If anyone has any ideas, let me know.