Player: I summon a Force 4 Fire spirit taking the form of an angel, as per my tradition. Then I attend the congregation in the chapel in the Baron's castle. I tell the spirit to stay hidden until i give it the signal, then repeat after my thoughts in a booming voice.
GM: Uhm...what does it say?
Player: It materializes in front of all gathered there and denounces the Baron as a vile and wicked man, trafficking in vile demonic artifacts that are offensive before the sight of the Lord, and that his laws and the gouging of his people is immoral and against the edicts of The Lord Almighty. Then the Angel brandishes it's flaming sword, pointing it directly at the Baron, and demands that he repent and work the rest of his days doing god's work, and set to right the evils which he has wrought. Further, he shall give to the humble priest there (pointing at me), the evil book which he does possess that the priest can dispose of it in a manner appropriate to the church and his judgement.
GM: But...this is a Catholic medieval style community, and the book is the objective! Oh, hell... *rolls some dice* Okay, the entire village of Munchmaussen now believes the Baron to be an evil overlord, and only holds off on lynching him when the Baron announces his intent to follow the angel's instructions. The Baron repeals all of his oppressive laws there, before everyone, and vows to go retrieve his unholy book. Then he gestures at you to follow him.
*later, in the elevator*
Baron: I know you summoned that spirit. Goldi told me. That was a real clever plan to get the book. You turned my people against me. Tell me why I shouldn't kill you now, then tell everyone you took it and left!
The player continues his innovative ideas and glibly comes up with a reason I can't recall at the moment, and the whole mission became a cakewalk.