bibliofecosis 

the immediate need to defecate brought on by proximity to reading materials. can be triggered by single books, this usually refers to the urge being brought on in a bookstore of sorts.
found on a reddit thread

Stitchopoulis can't walk into a bookstore without immediately being hit with a bout of bibliofecosis, and having to find the bathroom to take a shit.

bibliofecosis by grunzer November 22, 2010