Quotation
From IMDb:
http://www.imdb.com/title/tt1069238/trivia?tab=qt&ref_=tt_trv_qu
Yamashita: People are talking.
Daigo Kobayashi: About what?
Yamashita: Get yourself a proper job!
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Daigo Kobayashi: Long ago, before writing, you'd send someone a stone that suited the way you were feeling. From its weight and touch, they'd know how you felt. From a smooth stone they might get that you were happy, or from a rough one that you were worried about them.