The Master and His Pupil
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The Master and His Pupil is an English fairy tale collected by Joseph Jacobs in his English Fairy Tales.
[edit] Synopsis
Spoiler warning: Plot and/or ending details follow.
A learned man had a book in which he had the knowledge to control demons. His foolish pupil one day found it open and read a spell from it. Beelzebub appeared and demanded a task from him, or he would strangle him. The pupil set him to watering a flower, but Beelzebub went on watering it until the room was filling with water. At that point, the man, having remembered he left his book unlocked, returned and dispelled Beelzebub.
Spoilers end here.