When you realize you skipped the encounter with Napstablook. DAMNIT! Sorry guys. Oh yeah, and if some singing and music stuff comes on, I'm sorry. Don't worry it's classy, old fashioned music—that good vibe "jazz"-most of the time. Thus my inspiration. *Insert dramatic pose here*.

Frisk awoke to a darkened orange ceiling and the soft, but choppy, snoring of Flowey. Surprisingly calm, Frisk looked down at Flowey and couldn't help but laugh a smile spreading across their face like nothing had ever happened.
Flowey, startled by the muffled laugh, jerked up letting drool fling across the room. That only made Frisk laugh louder and kick the sheets off.
"Hey! What's so funny? You nearly scared the life out of me!" Flowey complained. It took a couple seconds, but once Frisk had regained their breath they said, "You snore! It's cute!" Flowey frowned, frustrated. "You and mom! Always saying I'm cute." If Flowey had arms he surely would've crossed them, but for now he had to simply shun Frisk.
Letting out one more giggle, Frisk carefully stepped out of the bed and groped around in the darkness for a lamp of some kind.
"Hey, watch it!" Flowey shrieked when Frisk nearly knocked him over. "Sorry," they mumbled rolling their eyes. After a minute or so of crashing into walls and wardrobes, the human found the lamp and played around with it until it turned on.
A small, warm light filled up half the room casting long shadows across the walls. In the middle of the room lay a slice of intact oozing pie.
"How did you not step on that?" Flowey asked, amazed by the undamaged piece of trash. Frisk shrugged and they both stared at the seemingly magical pie that lay in the middle of everything. "I don't think it's safe to eat?" Flowey suggested. Snails seemed to be oozing out still in their shells, but clearly dead. Frisk shook their head in agreement, they'd probably get poisoned just looking at it. Quickly deciding to leave, Frisk hopped over the pie and grabbed Flowey so they could step out into the lit hallway.
"You wanna explore some?" Flowey asked, looking at the other two doors with curiosity. Frisk shrugged in response and headed for the first door. Opening the door with a creak, the child and flower entered a calm, blue room. What a difference compared to the world they were in. Before them lay a cluttered bed and desk all filled with random papers and shreds of sheets. Next to that mess was a shelf of torn and tossed books, neither of the pair wanted to know what went on with the mad goat. Noticing something wriggling out of a trash bin next to the desk, Frisk set Flowey down next to a journal to inspect the object. It seemed the bin was filled with live snails, and Frisk reached out to pick up the creature. Meanwhile, Flowey was looking through the journal. "Look. A page of jokes," he said with interest.
"'Why did the skeleton have no friends?' 'She kill-' WHAT? Does she call these jokes? 'She killed them all', what type of joke is that?" Flowey looked scarred for life and seemed to be trying to claw his eyes out. Frisk dropped the snail and picked up Flowey with wide eyes. "Maybe we should leave this room," they said. Flowey nodded fiercely without the slightest bit of hesitation. In two steps they were both out the door.
"I don't want to check that last room. Please, let's just go to the other side of the house," Flowey whimpered. Frisk didn't argue and set off to the house's left wing. They found themselves in a living room with Toriel sitting in a scratched up brown chair, nose stuck in a book. They tried to sneak past her and into the kitchen, but Toriel was quick to realize they were there.
"My child! You're up, how delightful! I was going to tell you that I have planned to teach you all about the life down here and then we could discuss plans for leaving the ruins. Oh yes! I'm also reading this book about snails! Would you like to hear some facts?" Toriel smiled crookedly. Flowey cringed, but he answered after realizing Frisk wasn't going to, "Actually we'd like to know how to leave."
Toriel seemed to think that meant the opposite of what they wanted, "Did you know that snails starts with the letter 'S'?"
Frisk looked like they had just been hit in the head with a rock, "What?"
"Snails also ends with the letter 'S'!"
Frisk opened their mouth to say something, closed it, then opened it again, "Uhm, yes, but, we want to know how to leave."

Toriel continued.
"How about… Did you know that snails are very nutritious for you?"

And Frisk kept answering, getting more frustrated as their conversation continued.
"No, I didn't. Can you please help us leave?"

"Oooh!~ Snail shells are big enough to fit a monster's dust in it."

"Huh? Uhm, you're still avoiding my question to leave."

"You can also use them to fake monster dust!"

"Hullo? Excuse me, Toriel, can you please tell me how to leave?"

Toriel's face suddenly took an even more crazed look than before.
"You can shove snails into someone's throat to suffocate them."

"Alright, something really messed up is happening here," Frisk said, wide-eyed.

Flowey whimpered, "Can we get out of here?"
The crazed goat suddenly changed faces without warning.

"Please don't leave me, my child!" She cried.
Frisk and Flowey were frozen and place, cringing.
"Please give me a minute, I must go see to something." Toriel darted past them and they could hear the heavy foot steps of someone descending down to the basement.
It took a few seconds, but eventually the companions recovered from shock.
"Should we stay?..." Flowey asked. Frisk quickly shook their head. "You know the way out, right?" They asked with hope.
"Yeah, yeah. Go back to the entrance and down the stairs, just go on straight forever until you get to a huge door," Flowey said.
Frisk cautiously followed his directions, eyes darting around to make sure Toriel wasn't near.
They went down carpeted stairs and through what seemed like an endless purple stone hallway, and made a turn only to stop at the sight of Toriel speaking to the door. They quickly darted back to the edge of the wall, out of sight. Without intention they heard a fragment of the passing conversation.
"...to kill them when if no one else can…yes, it is… then farewell to you..."
The conversation ended there. And even though they knew it was risky, Frisk stepped out and approached Toriel and the door.'

That conversation part was just for "fun", if you're wondering why they're so out of character.
(The uh conversation part about leaving, y'know?)