final y , emma , charlotte , and madeline tumbled out into the night , linking arms and laughing at the best and worst costumes of the night-dorky amanda donovan , who 'd dressed as mr. peanut ; john pierce , a fabulous g*y boy who always had everyone laughing , who 'd come as lady gaga ; and , of course , davin-as-freddy-krueger , who 'd tortured madeline by extending and retracting his freaky knife-nails in her face al night .