a-plan
Explanation
The Joke
A woman is praying, saying: "Dear Lord, I'm told that you have a plan for everything. But the details are, let's say, hmmm, perhaps the grand sweep of things is according to my decision, but I permit you free will on that--" God (or a voice from above) enthusiastically agrees: "Yeah yeah yeah!" She continues: "So if the details don't matter, what could you show me that would not be consistent from your perspective, what is pretty much identical?" She then points out that God has a pony, "and all I've got is my daughter's hamster" -- which she says means "by definition it's unfair of me." God asks "Why?" and she answers "Bust of faith." The woman is essentially trying to use theological logic to argue that since God has a plan but the details don't matter, God should give her a pony instead of her daughter's hamster -- and framing her request as a matter of faith.
The Humor
The comic satirizes the common religious claim that "God has a plan for everything" by showing someone trying to exploit the logical implications of that claim. If God's plan is about the grand sweep and the details don't matter, then surely swapping small details (like giving someone a pony) shouldn't affect the plan. The woman is essentially trying to lawyer God into giving her what she wants by using God's own theological framework against Him. The phrase "bust of faith" is a play on "leap of faith," subverting the religious concept into a negotiation tactic. The humor lies in treating prayer less as reverent communion with the divine and more as a contract negotiation where the believer finds loopholes.