Board Thread:General Discussion/@comment-27907368-20160323193924/@comment-34518800-20160705161110

Starscream1998 wrote: Or if you wanna make the whole thing sad Frisk is still in the orphanage and the monsters under his bed have become the friends in his head he's so lonely. You could have an inception theme to it as well; which one is the true reality and which will you choose. NU STAHP DEH FELEZ

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The entire game is a play that they preform for the humans after a True Pacifist Route. That's why Undyne "forgets her lines".