Welcome to Cracktale, where Toriel is a cannibal, the snow in Snowdin is actually crack, underage kids are drunkards, and you’ll find monster kid with a machete. Also Papyrus is a horse.
And even worse Undyne dumps Alphys and marries Toriel instead. Alphas committed suicide, overwhelmed with grief. Flowey sings the same song as mentioned above. Mettaton kills Asgore. And best of all, nobody cares if you decide to do genocide. Umm, except Chara for some reason.