chapter 28-snapes worst memory

George and Fred are planning to cause total mayhem for Umbridge. They really don't care about getting in trouble anymore considering this year they'll be leaving so in celebration of N.E.W.T.s they tell Ron, Harry and Hermione they have something very special planned. Right before lunch that day Filch takes Harry up to Umbridge's office. She asks him to have a drink and slips a truth serum in it. She asks him again and again where Dumbledore is and where Sirius Black is but Harry is smarter than her becuase hes only pretending to drink it.