Yep, another Undertale one. To get to this moment, you have to find the MTT Hotel. Here are the lines because I have no introduction.

Well, here we are. So. Your journey's almost over, huh? You must really wanna go home. Hey. I know the feeling, buddo. Though... maybe sometimes it's better to take what's given to you. Down here, you've already got food, drink, friends... is what you have to do really worth it?
(Turns away)
... Ah, forget it. I'm rootin' for ya, kid.
(Turns away)
Hey, let me tell you a story.
So I'm a sentry at Snowdin Forest, right? I sit out there and watch for humans. It's kind of boring. Fortunately, deep in the forest there's this HUGE locked door. It's perfect for practicing knock-knock jokes. So one day, I'm knocking 'em out, like usual. I knock on the door and say 'knock-knock,' and suddenly, from the other side, I hear a woman's voice. 'Who is there?' So, naturally, I respond: 'dishes.' 'Dishes who?' 'Dishes a very bad joke.' Then she just howls with laughter like it's the best joke she's heard in a hundred years. So I keep 'em coming , and she keeps laughing. She's the best audience I've ever had. Then, after a dozen of 'em SHE knocks and says 'knock-knock!' I say 'who's there?' 'Old lady!' 'Old lady who?' 'Oh! I did not know you could yodel!' Wow. Needless to say, this woman was extremely good. We kept telling each other jokes for hours. Eventually, I had to leave. Papyrus gets kind of cranky without his bedtime story. But she told me to come by again, and so I did. Then I did again. And again. It's a thing now. Telling bad jokes through the door. It rules.
(Turns away)
... One day though, I noticed she wasn't lauging very much. I asked her what was up. Then she told me something strange... 'If a human ever comes through this door... could you please, please promise something? Watch over them, and protect them, will you not?' Now I hate making promises, and this woman, I don't even know her name, but... someone who sincerely likes bad jokes... has an integrity you can't say 'no' to.
(Turns away)
Do you get what I'm saying? That promise I made to her... you know what would have happened if she hadn't said anything? Buddy...
(Deep creepy voice)
YOU'D BE DEAD WHERE YOU STAND.
(Normal Sans)
... Hey, lighten up, bucko! I'm just joking with you! Besides... haven't I done a great job protecting you? I mean, look at yourself. You haven't died a single time. Hey, what's that look supposed to mean? Am I wrong...? Heh. Well, that's all. Take care of yourself, kid. 'Cause someone really cares about you.
(Leaves)

Loong dialogue! I could have shortened that, but I didn't really want to. Well, if you didn't pick up on this, the woman was obviously Toriel, and she wanted Sans to protect the human. Sweet, if you ask me.

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