The textbook’s のです／んです becomes んだよ when you insist or complain to someone close.
Insisting or complaining. Warm with friends, pushy with a boss.
One performer is acting strangely cheerful, and the partner starts calling this out.
Don't 'isn't it funny' me!
Textbook「おかしいじゃない」ではないのです。「ではないのです」→「じゃないんだよ」: 「では」 shortens to 「じゃ」, 「の」 to 「ん」, and 「だよ」 replaces 「です」 — a pushy, annoyed correction.
A performer politely tells the audience a strange story about an electric kettle that seemed to be staring at them.
and I ended up making excuses like, 'This isn't my fault. No, you've got it wrong!'
Textbook「これは私のせいではありません。いいえ、違うのです」と言い訳をしてしまったのです。'違うのです' → '違うんだよ': 'の' contracts to 'ん', 'です' becomes plain 'だ', and 'よ' adds pushy insistence to the excuse.
Grandpa wants to go to Reiwa University, and a student is trying to talk Grandpa out of it.
I mean, mornings are brutal when you've got first period.
Textbookいえ、一限の授業がある人は、朝がつらいのです。「つらいのです」 becomes 「しんどいんだよ」: の shrinks to ん, です drops to plain だ, and よ presses the explanation on the listener. しんどい is casual 'rough'.
Someone is about to open something that has just turned up.
No, where the heck are you hiding?!
Textbookいいえ、どこに隠れているのですか。"隠れてんだよ" = "隠れているのだよ": "ている"→"てる", "の"→"ん" (which swallows the "る": "てるん"→"てん"), plus "よ"; the "に" after "どこ" is dropped.
The comedian imagines being reimagined as a beautiful girl, with busty and flat-chested versions made as trends swing back and forth.
Culture note Japanese games and anime often reimagine famous men from history as cute girl characters.
riding it is me, and I become the perfect beautiful girl!
Textbook私だけがこのメビウスの輪に乗って、完璧な美少女になるのです。"なるのです" becomes "なるんだよ": "の" shrinks to "ん", "です" becomes plain "だ", and "よ" adds insistence.
A tough-talking man lectures someone about luck, ability, and what it takes to survive.
Anyone without skill can't survive in this world, you hear me?
Textbook実力がない人は、この世界では生きていけないのです。The "の" of "のです" shrinks to "ん" and "です" becomes plain "だ"; "よ" adds insistence. Also "ない" roughens to "ねえ", "では" to "じゃ".
From other routines in the library. Automatic transcripts, not yet checked line by line.
〜んだよ means explaining, insisting, complaining. The textbook’s のです／んです becomes んだよ when you insist or complain to someone close.
With friends: OK. With coworkers: careful. With a boss or teacher: avoid. Insisting or complaining. Warm with friends, pushy with a boss.
In 1,905 live comedy routines, 〜んだよ appears in 5,611 lines from 248 comedians.