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The story
A shouting match broke out on 5ch’s Hardware/Industry (Geha) board over the meaning of the phrase “狂気の沙汰じゃない” (“not an act of madness”). It started with a post describing a game console’s price as “狂気の沙汰じゃないじゃん” (“isn’t that madness?”), which drew a reply pointing out that read literally, the phrase should mean “not madness = normal.” From there, opinion split over whether this is one of those distinctly Japanese expressions — like “冗談じゃない” (“no joke”) or “笑い事じゃない” (“no laughing matter”) — that stay in the negative form while actually carrying an intensified meaning. Some posters even pasted in an AI’s answer to the question, but were called out for the structural difference from the other ironic expressions cited, and the thread went in circles without ever reaching a conclusion.
What people said
PS5: ¥55,000
Switch2: ¥60,000
Of course you're playing it on the Switch2
Figures 😄
Is this a traditional craft or something?
"An act of madness" → means crazy
Get it?
Guess not… go redo grade school
So by that logic, does "not an act of madness" = "a sound, sane judgment"?
That's describing something as crazy.
So "not an act of madness"
negates the madness — you're saying that makes it normal?
Breaking it down literally:
"act of madness" = an act/judgment that seems out of one's mind
"~janai" = "is not ~"
So normally,
"not an act of madness" = can only be seen as madness / can't be read as a sane judgment
That's the meaning.
That's backwards, isn't it
Stop treating "janai" as if it were affirmative
but it would mean "a non-crazy act = an ordinary act"
Re: #24
Maybe go redo grade school?
Even the 🐷 (slang for Switch fanboys) should get it now, right?
In that case it'd end with "isn't it?" instead, so sure, that works
But Re: #1 doesn't end that way
the "~jane?" that gyaru and delinquent types use
with "janai"?
The "~jane" nuance is already covered by the "jan" tacked onto the end of "not an act of madness"
No — you said yourself that "janai" = "is not,"
it's not being used like the tag-question "isn't it?"
1. "Act of madness"
– An abnormal, reckless, dangerous, out-of-your-mind act
– A word that bluntly criticizes the act itself.
2. "Not an act of madness"
– Grammatically this can be read as "not madness = normal"
– But in actual Japanese usage it functions like a "double negative"
I went "huh?" and pressed further
Why does the meaning get stronger despite being a negative?
This is a quirk of Japanese —
some expressions use the negative form to create an even stronger affirmation or emphasis.
Examples:
– "no joke" = too serious to just laugh off as a joke
– "no laughing matter" = too serious to laugh about
– "no ordinary matter" = so abnormal it's out of the ordinary
By that same structure,
> "not an act of madness" = so crazy there's no calling it anything but an act of madness
is what you get.
That's the AI's take on it
Who knew there was a trap like this 🤔
lol, the structure's completely different from those 3 examples
If you can't actually read Japanese you'd probably just believe this…
Guessing you're not the type to crack open a dictionary like Kojien instead of trusting an AI…
This one's normal usage
"a sane act" and "not a sane act" are a matched pair of opposite expressions — the former means "a sound judgment," the latter means "behavior beyond common sense."
"You can tell 'a sane act' and 'not a sane act' apart, so isn't it weird that 'an act of madness' and 'not an act of madness' mean the same thing?"
Push on that and you get this back:
"The 'that's weird' feeling you have is correct.
Due to Japanese ironic/rhetorical phrasing,
– a negative form can end up meaning something stronger than the affirmative
– 'not an act of madness' ends up meaning the same as, or even stronger than, 'an act of madness'
This is the phenomenon at play."
It just kept insisting it's an ironic/rhetorical expression no matter what
For a second I thought it might be that same tone, but since it's followed by "jan," guess not
If that were it, the "jan" at the end would just get in the way
You can tell just by looking at Re: #1 —
it's "not an act of madness, right?" (jan), so the phrasing already closes off that escape route itself
Background and points of contention
This thread kicked off during a discussion about the price gap between game consoles, when disagreement broke out over what the phrase “狂気の沙汰じゃない” (“not an act of madness”) actually means. Japanese has expressions like “冗談じゃない” (“no joke”) and “ただ事じゃない” (“no ordinary matter”) that take a negative form yet function as strong affirmations of their content. The sticking point in the thread was whether “not an act of madness” belongs to that same family, or whether it should be read literally as “not madness = normal” — and the debate went in circles without a dictionary-backed answer ever settling it. Some posters cited an AI’s answer as evidence, but were pushed back on the grounds that its structure differs from the other ironic expressions it cited, and the argument never got resolved. What’s easy to miss here is that this isn’t just wordplay — it grew out of underlying tension over game console pricing, and some replies included strong language mocking a particular fanbase, which this article has left out.
※This article is excerpted and summarized from the 5ch (Hardware/Industry [Geha]) thread “Piggy mouths off thinking the idiom “act of madness” doesn’t exist.”
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