It's a fantasy role-playing game.

DM: You are Caleb Widogast, a human wizard . You are the member of the famous group of adventurers. Previously, While Beau throws wild haymakers, missing with her first hit, Dairon retaliates with only very light, disciplined taps. Beau's next few hits land hard.
DM: You head inside. It looks as chaotic as you left it. You see what looks to be a small bowl of heated porridge that's gathered on the counter, and cross-legged on top is the fantastic gnomish purveyor of the interior, Oglen. "Hello?"
Player: Good day to you, sir!
DM: "Good day to you as well."
Player: I give Nott a little shove over towards the shelves and walk up to him, right up to the counter. What are you eating there? That looks good.
DM: "Breakfast."
Player: All right, yeah. That's what that is. You know, I wanted to thank you for the book. I don't know if you read it yourself, but I read it cover to cover quickly. It was fascinating and very useful. [aside, quietly] I hope you're doing stuff over there.
DM: "All sales are final!"
Player: Well, here's the thing. I have read this book and loved it, and if you would like to purchase it for the low, low price of one gold, you can sell it again. You sold it to me for three. You have it back for one. You can turn a profit.
DM: Make a persuasion check.
Player: Natural 20.
DM: You watch as some of the porridge is spilling out the side of his mouth, and he rubs it off. "All right." And he pulls a gold coin out of his pouch.
Player: That is a good decision, and it was a good book. I am grateful for the knowledge you have imparted upon me.
DM: "Might I have the book?"
Player: Oh, of course! It's right here on the table. Sorry, grandfather.
DM: "All sales are final."
Player: Right. You will not sell that back to me, for sure.
DM: "Do you want it? I can sell it to you for three gold."
