You enter the Grey building and suddenly feel a strike to the back of the head.

"THIS IS MY GREY BUILDING! DIE INTERLOPER!" a voice shouts as you try to get back up. A heavy boot kicks you in the face and everything goes black.

The last thing you hear is a rusty chainsaw.
The last thing you feel is that chainsaw entering your back.
The last thing you think is that this is the GREY Building not the GRAY Building.