What is the likelihood of an apocalypse like the one of “The Last of Us” actually happening? Dr. Cameron Carlson of the Zombie Research Society told the “Something Offbeat” podcast that one of the greatest zombie risks may be hiding in litter boxes. Carlson and host Mike Rogers also discussed the real-life Ophiocordyceps unilateralis fungus that inspired the pandemic depicted in the ‘Last of Us’ video game and HBO show.