All of the monsters are at Grillby's right now, and you're sitting alone in a cornereating

Sans: "Hey, Grillby. Can you get me another bottle of ketchup?"

Grillby: "Certainly, sans"

he goes and gets the ketchup for sans

Papyrus: "sans... why do you love that stuff so much..."

Undyne: "Leave the guy be, papy. He loves ketchup"

Toriel was just observing the situation and trying not to laugh

Flowey notices you and observes you. Thinking he could use you to kill the others