The Hospital is an area accessible from Graveyard World through the vomiting heart.
Features
This area is quiet, which is to be expected from an area named after a characteristically quiet sort of place (that is, a hospital). When you walk in, there is a waiting room with rows of chairs, a receptionist's window and a locked door.
If you go through the doorway on the westernmost wall, you will come to a series of hallways of patient's rooms that you can go in. Many are empty, but some contain random monsters that you can chainsaw. You may also come across a room with a moving duvet cover. Interacting with this will make it leak green slime (possibly IV fluid) and you will be transported to Cripple-Tan.
If you walk all the way to the last hallway and go into the first door you see, you will be transported to another hallway which leads to the Hospital Outskirts.
Hospital Outskirts
This area has a psychedelic blue-green background, white paths and calm background music.
From here, the Chainsaw effect can be obtained by stepping on the red teleporter located south-southwest of the entrance to the Hospital Outskirts. You'll be in a small area with lots of vomiting suits and a scrolling background. By entering the mouth of one of the vomiting diamonds, you'll find a lone chainsaw where you can get the effect from.