You'd finally made it to the Judgement Hall, after murdering your way through the Underground. Ruins, Snowdin, Waterfall, Hotlands, Core ... All rid of people because of you and your morbid curiosity.

But there was one person who seemed to know everything about you at a glance. Someone ... unsuspecting. Even gracefully accepts the title of "lazy."

And against all odds, here you and him were, face to face in the final corridor.

"heya," Sans says, breaking the tense silence. "youve been busy, huh? well lemme ask you a question ... do you think that everybody can change ..? that anybody can be a good person, if they try hard enough?"

...

"heh... ive got a better question for ya," he says, the lights indicating his pupils vanishing.

"do ya wanna have a bad time?"

And with that, the fight shall begin. (Que the Megalovania!)

"its a beautiful day outside. the birds are singing ... the flowers are blooming. on days like these, kids like you ... should be burning in hell."