“You’ve come into possession of one vial of truth serum. Who would you give it to (with the person’s consent, of course) — and what questions would you ask?”
When I read this prompt I remembered an old joke.
A man asks a woman: “What can I give you to get your love?”
She answers: “Permanent anesthesia!”
In this case the woman is truthful and she answers the man’s question without hesitation.
Now, if I had a vial of truth serum it would make no sense to give it to anyone who is a truthful person.
So a right decision would be to give it to a liar.
However, can anyone believe that a liar consents to drink truth serum?
So I’ll put the vial in a vault together with a copy of the prompt!
Hopefully, in three hundred years somebody opens a vault, reads a prompt and asks: “Could it really be that there were liars three hundred years ago?!”