一个有自毁倾向的青少年被寄宿学校停学后回到家中，却发现他的奶奶住进来了，可他压根不晓得他还有个奶奶，这个从天而降的奶奶不仅酗酒成性精力旺盛能将他跟朋友都灌趴下，而且粗俗滑稽天不怕地不怕，甚至老来俏爱卖弄风骚，简直是奶奶中…

When the Herring family wake up in a basement after a car accident, the only thing scarier than not knowing how they got there, is realising that they're not alone.