You are looking for a bison tube hidden inside of a larger Halloween themed container. This cache has been placed to celebrate the 2015 Northern Virginia Geocaching Organization (NoVaGo) Fall Event: Hauntingly Familiar.
Memento Mori. A reminder that this life if transitory, both to caution against spending time wastefully, and to remind us all that the time we have is something to treasure. Different cultures have embraced this concept in a variety of ways over time, in manners both somber and celebratory. This geocache takes on a more playful theme to celebrate the season and this event.
Purpx gur fueho, Oho.