Grillby's

Grillby's is one of the many buildings located in Snowdin, found to the right of the town.

Description
Grillby's is a resturant/pub of sorts which is ran by Grillby, a monster made entirely of fire. This is where many different characters can be found relaxing and talking, with Sans seeming as a regular visitor of the establishment.

It contains several booths, tables, a bar and a broken jukebox. As mentioned above, it contains a variety of characters, including: And many other unnamed monsters.
 * Lesser Dog
 * Greater Dog
 * Doggo
 * Dogamy and Dogaressa

Main Story
Pacifist Run/Neutral Run:

After sparing Papyrus and making it to the entrance of to the Waterfall, Sans will ask you if you want to go to Grillby's, as he's on one of his "legally required work breaks." If you agree, he'll tell you to follow him, as he has a shortcut, and will proceed down the path you would take to go to the Waterfall, which "transports" you to Grillby's.

Upon arrival, Sans is greeted warmly by the many patrons as he takes a seat alongside you at that bar, and asks what you'd want, giving you the option of getting a burger or fries. (This decision not being of any affect towards the story)

Now, while waiting for your food to arrive, he begins to strike up a conversation, going on about how Papyrus had begged Undyne to allow him to join the royal guard, and the "training" he was receiving from Undyne. Afterwards, he tells you about how Papyrus had been getting advice, encouragement, and even predictions from a talking flower, but brushes it off as if he felt it was simply and Echo Flower being used to play a trick on Papyrus.

After this discussion, Grillby brings the player and Sans the dish that the Player had chosen in the beginning of the discussion. Shortly after, Sans asks the player if they're going to need the ketchup for their food. Once again prompting a choice by the player, they can either choose "yes" or "no." Afterwards, Sans will say hat he needs to get back to his post, as the Player had "held him up" and asks if the player is willing to pay the 50000G needed for the meal, prompting yet another yes/no question. However, despite the player's response, Sans will say that he's just joking, and will tell Grillby to just put it on his tab.
 * If the Player says yes, they'll try to take the ketchup as Sans passes it to them, only to have it drop and spill over the dish.
 * If the player says no, then Sans will says that it means that there's more for him, and proceeds to chug the entire bottle in one sitting.

Genocide Run:

The entire building with be entirely empty, as all of Snowdin had been evacuated at this point; and as such, the Sans talk will not initiate.

Trivia

 * It's noted by Papyrus that Sans usually eats out every night, and only recently began attempting to cook. It can be assumed that Grillby's would be the "out to eat" that Papyrus was mentioning.
 * There's a "fire escape" to the let of the building, which notes that you can't use it since you aren't made of fire.