You visited Sans and Papyrus’s house because you forgot about the shrine that was under Papyrus’ sink. Once you made it, You noticed the red and blue seals were unlocked so you decided to enter. As you did, you saw a Mew Mew doll. You scratched it behind the ears. You could’ve sworn you heard giggling.. as you went to go scratch its ears again, it suddenly shouted out..

“ENOUGH! ENOUGH! ENOUGH!”

“FOOL! DONT YOU KNOW NOT TO TOUCH PEOPLE YOU DONT KNOW?!”

Uh oh.