The dark brotherhood know too much about you. When you do the quest to kill the guy from the begining in the jail, he starts saying "You should know the way.HAHHAAH" Where did they find all this out? I dont get that.
wierd thing is mr.Kitty Cat(or whatever his name is) becomes very friendly in the purification quest, the DB quests consatanlty try to put you into moral dilemas, liek "would you kill an old man while he is sleeping ?" or "would you poison an sick man ? "....