The Ravenclaw boy slowly opened the door and looked inside. He wanted pay backs for how mean the professor had been in class. He found her to be rude, crude and unjust. He opened several draws and placed several Dung bombs in each one. He also piled a few on things out is the open. He turned to go. Just before he closed the door he waved his wand and all the bombs went off. Leaving the teacher's office in quite a mess.