Board Thread:General Discussion/@comment-27907368-20160412010659/@comment-27620479-20160506195258

There are bathrooms in the Underground.

I know, you don't see any, and I'm not sure where they are either, but here's what I believe to be proof that they have to exist.

1.: Monsters can't cross the barrier. So, they can't just go to any bathroom on the surface.

2.: Yet, we know that Papyrus showers in his battle body. So far it is still only speculation, as monsters may not take showers in bathrooms.

3.: Papyrus has never seen a human, and obviously knows next to nothing about anything related to humans.

4.: Yet, when he wants to leave a human and Undyne alone, to sort out their differences and become friends, he finds going to the bathroom a good excuse.

5.: Even if only humans had bathrooms, and Papyrus somehow knew about it, he wants to excuse himself from a supposed private meeting with Undyne. Saying things that only make sense to a human won't do.

6.: Especially that Undyne hates humans, and Papyrus knows it.

7.: If you check the window, Undyne mentions that Papyrus "normally nails the landing". So, he jumped through the window before. Unless he uses a different excuse every time, he already told Undyne that he was going to the bathroom.