You can think of a house with too much going on inside it and nobody in charge — doors banging, voices over voices, no way to make it quiet. The word names a building first and a feeling second, and every use keeps that shape: it is always a place, never a person.
可以想成一棟裡面鬧翻天、又沒人管得住的房子。門在甩，說話聲蓋著說話聲，怎麼樣都安靜不下來。這個字先是在講一棟房子，其次才是那種感覺。兩種用法都守著同一個形狀：它指的永遠是一個地方，不是一個人。
From the word’s history
The word is simply mad plus house. It began as the name of a real building, and the modern everyday use borrows that building as a picture.
這個字就是 mad（瘋、失控）加 house（房子）。它一開始指的是真的一棟建築，現在日常最常用的意思，是把那棟房子借來當畫面用。
Wiktionary (kaikki extract, source_ref kaikki:3f6f69a190036ae4:1115938718:18796), entry 'madhouse': From mad + house.
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