You can have some fun with people whose anticipations get out of sync with what they believe they believe.
I was once at a dinner party, trying to explain to a man what I did for a living, when he said: "I don't believe Artificial Intelligence is possible because only God can make a soul."
At this point I must have been divinely inspired, because I instantly responded: "You mean if I can make an Artificial Intelligence, it proves your religion is false?"
He said, "What?"
I said, "Well, if your religion predicts that I can't possibly make an Artificial Intelligence, then, if I make an Artificial Intelligence, it means your religion is false. Either your religion allows that it might be possible for me to build an AI; or, if I build an AI, that disproves your religion."
There was a pause, as the one realized he had just made his hypothesis vulnerable to falsification, and then he said, "Well, I didn't mean that you couldn't make an intelligence, just that it couldn't be emotional in the same way we are."
I said, "So if I make an Artificial Intelligence that, without being deliberately preprogrammed with any sort of script, starts talking about an emotional life that sounds like ours, that means your religion is wrong."
He said, "Well, um, I guess we may have to agree to disagree on this."
I said: "No, we can't, actually. There's a theorem of rationality called Aumann's Agreement Theorem which shows that no two rationalists can agree to disagree. If two people disagree with each other, at least one of them must be doing something wrong."
We went back and forth on this briefly. Finally, he said, "Well, I guess I was really trying to say that I don't think you can make something eternal."
I said, "Well, I don't think so either! I'm glad we were able to reach agreement on this, as Aumann's Agreement Theorem requires." I stretched out my hand, and he shook it, and then he wandered away.
A woman who had stood nearby, listening to the conversation, said to me gravely, "That was beautiful."
"Thank you very much," I said.
Part of the sequence Mysterious Answers to Mysterious Questions
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I attended a lecture by noted theologian Alvin Plantinga, about whether miracles are incompatible with science. Most of it was "science doesn't say it's impossible, so there's still a chance, right?"-type arguments. However, later on, his main explanation for why it wasn't impossible that God could intervene from outside a closed system and still not violate our laws of physics was that maybe God works through wavefunction collapse. Maybe God creates miracles by causing the right wavefunction collapses, resulting in, say, Jesus walking on water, rising from the dead, unscrambling eggs, etc.
Recalling this article, I wrote down and asked this question when the time came:
I wanted to see if he would accept a falsifiable version of his belief. Unfortunately, he said something like "Oh, I don't like that theory, I don't know how it would work with a million versions of me out there" and ignored the "if" part of the question. (I would have liked to point this out, but the guy before me had abused his mic privileges so I had to give it back.)
(Also, is that a fair layman's representation of many-worlds? I'm normally very wary of using any sort of quantum physics-based reasoning as a non-quantum physicist, but, well, he started it.)