Maybe not evil, but what if I open one up and tribbles start to fall out of it?

( fine then. he moves those specific books into--another pile of books, mildly out of the way and just barely within arm's reach. his fingers instead grab onto an old leather bound, titleless book, and sets it just a bit away from his own mug. )

No one wants to deal with an army of tribbles. --are you sure you're okay?