According to the director, "One of the things that was most appealing to us was the initial idea of a 15-year-old kid and a 50-year-old man becoming friends and equals".
據導演所述，「其中一件對我們來說最吸引人的事是一個十五歲的小孩和一個五十歲的男人成為朋友兼同輩。