WhiteDwarf: A spider would be a useful ally, but on the other hand... There is no other hand, acquire the spider
WhiteDwarf : imagine how menacing it would be to have a pet spider
Stealing HeadOfSecurity's office pet seems petty, but it's a spider. It practically oozes demonic menace, and you're pretty sure the average foolish rent-a-cop lacks the force of will and the spirit required to cultivate its overwhelming sinister power. You will require a sufficiently dramatic name for it, but the inexplicably intense interest you suddenly have in arachnid possession simply cannot be denied.
You leave with Spider in hand.