It's a fantasy role-playing game.

DM: You are Fjord, a half-orc warlock . You are the member of the famous group of adventurers. Previously, Matthew will be at Otafest in Calgary, up in Canada, May 18th to the 20th, and A-Kon in Texas June 7th through 10th.
DM: "I respect your candor. I see that you have a keen mind for business relationships. However, I do have to turn a profit. So I can't do much for you there, my apologies."
Player: I understand. Healing potions were how much again? 70 gold?
DM: "No, those were 50 gold apiece."
Player: 50 gold. Wow, I got to work on my fucking memory. Great, I will take a healing potion and the enchantment transfer, please.
DM: "Fair enough. That will will run you 100 and--"
Player: 30.
DM: "30 gold pieces, that's correct. There's your healing potion. You get your basic one right there."
Player: Okay, thank you.
DM: "It'll take about an hour to transfer this here enchantment for you. So be patient and come back in about 60 minutes. Should be ready to go."
Player: Yeah, I take the breastplate part of my leather armor off and leave it with you.
DM: "Oh, this is-- want us to clean it for you?"
