101 Zen Koans – Number 65 | Bukisa.com

65.   The Subjugation of a Ghost

A young wife fell sick and was about to die. "I love you so much," she told her husband, "I do not want to leave you. Do not go from me to any other woman. If you do, I will return as a ghost and cause you endless trouble."
Soon the wife passed away. The husband respected her last wish for the first three months, but then he met another woman and fell in love with her. They became engaged to be married.

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Immediately after the engagement a ghost appeared every night to the man, blaming him for not keeping his promise.

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101 Zen Koans – Number 65 | Bukisa.com