After reading a lot of film reviews and short reviews, everyone acquiesced that the title of the good neighbor is a kind of irony, but from the perspective of an old man - at least if I were that old man, I would think it was a good ending.
First of all, the reason why the two young people were hostile to the old neighbor and chose him for the experiment was that the old man was very bad and withdrawn (ignoring the personal grudges between the long-haired young man and the old man for the time being). Or the old man's loneliness and loneliness is the background of the story;
And this background is also explained at the end of the film: after many years of death with his beloved wife, the old man has lost his enjoyment of anything in life.
Therefore, in my opinion, the two young people accidentally collided and evoked the memories of the old man, so that the superposition of various phenomena caused the old man to have a hallucination that his wife was calling him, and finally committed suicide after the bell appeared.
Those horrific pranks in the eyes of young people and moviegoers may be a happy memory for the old man (it's not impossible to put yourself in his shoes), so I think it can be considered that suicide is also a relief and relief for the old man, after all, his His heart has been broken with the death of his wife. In the last few weeks of his life, he was able to spend the last few weeks of his life in a terrifying way. For him, I really want to thank two good neighbors.
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