Had to go somewhere,Something happened in the family,did it but brother/sister/cousin played with it or drew on it because they thought it was scratch paper,mom saw it on the floor thought it was trash and threw it away,cleaning up the house and threw it,spilled something on it,flew out the window (say your escrivaninha, mesa is near an open window,)sister/brother/cousin teared it or threw to it to the ground because you didnt do want he/she wanted you to do... Think.