get into your closet and hide in the farthest corner but take your phone. Then text your parents (turn your sound off and even your vibrate) if they are there if they aren't go out a window and go to your neighbor's house. but if you don't quietly open your door and bolt to a room that does or if you can the front door don't trip and keep a cool head also investigating isn't a good choice and just hope that it was only something falling down.