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The film was inspired by a story Piero Messina heard from a friend , about a father who had lost his son , and when the father refused to talk about it , people around him began to act as if it had never happened .
 Piero Messina
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Piero Messina