When Minny was working for Hilly's mother's, Hilly treated Minny poorly and always accused her of trying to steal things from the home.  Minny was fed-up with Hilly's disrespectful attitude, so she made a chocolate mousse pie and put her own excrement into the mousse.  Minny would not let Hilly's mother eat any of the pie, and insisted that it was only for Hilly to enjoy.  Hilly ate it up.  Minny was initially excited about her revenge, but afterwards, she realized that her actions could have severe consequences.  No one will want to hire Minny as a maid if word gets out about what she did, and Minny fears that she will be left without a job.  But Hilly cannot stand for anyone to know this because she too will be socially embarrassed having to admit that she ate the pie.