何(なん)だってWhat?!, Why?, Come again?, anyone, anything

私(わたし)は家族(かぞく)が幸(しあわ)せなら後(あと)は何(なん)だって構(かま)わない。

If my family is happy, I don't care about anything else. {What?!, Why?, Come again?, anyone, anything}

上司(じょうし)：「問題(もんだい)発生(はっせい)？何(なん)だって？どうして黙(だま)っていた？」

Boss: "A problem occurred? What?! Why have you kept silent?" {What?!, Why?, Come again?, anyone, anything}

不良(ふりょう)：「おい、お前(まえ)。何(なん)だって？もう一度(いちど)言(い)ってみろ！」

Delinquent: "Hey, you. What did you say? Say it again!" {What?!, Why?, Come again?, anyone, anything}

喧嘩(けんか)中(ちゅう)、ルームメイト：「何(なん)だって戻(もど)ってきたんだ？出(で)ていくって言(い)っただろ？」

During the argument, the roommate said: "Why did you come back? I told you to leave, didn't I?" {What?!, Why?, Come again?, anyone, anything}

部下(ぶか)：「今日(きょう)をもって退職(たいしょく)します。」上司(じょうし)：「何(なん)だって？そんな事(こと)、聞(き)いてないぞ！」

Subordinate: "I will retire as of today." Boss: "What?! I haven't heard anything about this!" {What?!, Why?, Come again?, anyone, anything}