[It's not his fault that he wandered into the inviting-looking room. There was coffee.
So, he's splayed out in an overstuffed armchair in a corner, drinking his (only mildly terrible) coffee, grumpily ignoring his sudden urge to save the world or some shit.
Or make a sign warning people about the room.
Mantis starts psychokinetically shuffling through the bookshelves and cushions and whatnot, looking for a pen.]
((Have a Room of Opposite Alignment! Go inside, and your alignment will flip completely--Lawful becomes Chaotic, Good becomes Evil, and Neutral wonders why the hell everyone's acting funny. Online alignment test is
here, and an explanation of alignment is
here.
Of course, some may find the room's effects aren't limited to D&D alignment...))