Why is dialogue so emotionally exaggerated in Japanese film?

Whether it's Japanese movies, anime, or short films, it always seems as if the dialogue between characters are unnecessarily exaggerated, from reactions to exclamations and even to narrations. It always seems to give the pieces a campy feel, and, in my own opinion, rarely reflects realistic dialogue. Where does it come from? Is it the Japanese language itself? Do Japanese actors and directors choose this path consciously, or is it just a cultural thing? Or am I just crazy? Thanks in advance!

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