His initial theory of being on a spaceship, while comforting, had been proven by further observation to be false.  As long as his new world had consisted of nothing outside of his hospital room, the theory could hold.  He could explain away the discrepancies.  But once he went into the hallway, the working theory began to collapse.  While they might have redecorated a single room into what they believed was a comforting location for him, they hardly would have done the entire hallway.  If they had put that much effort into it, they would have at least tried to make the bathroom look familiar.  As it was, he recognized not a single fixture, and could only begin to guess at the purpose of each.  Fortunately for his bladder, but less so for the therapist he was sure he would eventually be seeing, he’d gotten a valuable insight into the workings of the plumbing and the extreme lack of modesty the ponies displayed.  Since they apparently went around nude everywhere with only hats and butt tattoos as uniforms, he probably shouldn’t have been surprised, but it was something he desperately wanted to forget.  Simply pointing towards the fixture he was to use would have sufficed, in his opinion.  At least she’d been kind enough to look away when it was his turn.