midnight
The pillow slip was tied firmly about her neck to allow no chance of slipping , the ears waved lopsidedly ; she was the most amazing specter that ever left a respectable grave . These preparations had occupied some time . It was already ten minutes of twelve . `` I 'll wait till the stroke of midnight , '' said Patty . `` Then I 'll flutter into Evalina 's room , and wave my wings , and whisper , ` Come ! ' The monkey-wrench and the pie , I 'll leave on the foot of her bed , so she 'll know she was n't dreaming . '' `` What if she screams ? ''