What tricks were played by the twins on the ghost?

The Otis twins plagued the Ghost so much that the he was very much afraid of the two boys. The twins would throw pillows at his head and shoot him with their pea-shooters. They would also  shout "Boo" into the ears of the Ghost, when he was unaware of the twins presence. The twins had even put a jug of cold water on a door, so that when the Ghost opened the door, he would be drenched. The Ghost caught a terrible cold because of this incident! Finally, the twins with the help of their brother Washington Otis made a false scepter and frightened the Ghost out of his wits.