SINCE WE LIVE IN HOUSE, AND BRICKS ARE AT LEAST PARTIALLY MADE OF ROCK, THEN TECHNICALLY WE ‘LIVE INSIDE A ROCK’; MEANING WHEN WE ASK SOMEONE IF THEY ‘LIVE UNDER A ROCK’, WE’RE ASKING THEM IF THEY DUG A TUNNEL UNDER THEIR HOUSE, AND LIVE IN THAT TUNNEL INSTEAD OF THEIR HOUSE