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, Although not knowing anything about the new owner of The Leaky Tap, Lauren Schvine, Beauregard has a negative opinion of her and doesn't want to get to like her, apparently due to wanting to someday own the tavern herself. They head out into the streets of Zadash, in full RenFaire revelry.
DM: While this was transpiring, you guys go to catch up while Caleb and Nott have approached the young half-elven woman who is shouting, "King's Vault!" As you approach, you see she has her hair tied back, and she's barking with this utmost confidence. "King's Vault! Come play! Anyone, come to the front! Show us your majesty of attention!"
Player: Yeah, what sort of game is it that you are running?
DM: "Well, you place either a silver or a gold piece up and I will--" and she pulls up three silver cups. "I will place it underneath one of these. Mix it around. Pay attention. Guess the right one. Get your coin back plus one. Get it wrong, coin stays with me. Simple game."
Player: Well, I just so happen to have three silver on me. It takes one silver to play?
DM: "Yes. At least."
Player: At least. Well, I am feeling lucky today and always. Here it is.
DM: "Onto the table." She takes the center cup (click). Cup's over it.
