It was the rats;
the slithering scurrying rats whose scampering will never let me sleep;
the dæmon rats that race behind the padding in this room
and beckon me down to greater horrors than I have ever known;
the rats they can never hear;
the rats, the rats in the walls.
H. P. Lovecraft
So Chris Muth gets dragged off to the psych ward to treat his bizarre delusion, because he hears a cat behind his wall that no one else can hear. Then they finally have to let him out after his neighbours start complaining about that darn cat behind the wall. (CHT Gavin in a comment on Charles blog.)
I guess Straczynski is luckier than he knew.