Adam Scott and David Koechner are the latest stars to join the horror comedy Krampus.The Legendary Pictures project is based around a demon who brutally punishes naughty children during the Christmas season.Hot Tub Time Machine 2 star Scott and Anchorman 2: The Legend Continues actor Koechner have both signed on to play fathers of missing children in Krampus, with TheWrap reporting that Stefania O