YOU SAID:
I can't believe you've done this you've got to be joking
INTO JAPANESE
あなたがこれをやったなんて信じられない
BACK INTO ENGLISH
I can't believe you did this
INTO JAPANESE
なんて事をしたんだ
BACK INTO ENGLISH
I can't believe you did this.
INTO JAPANESE
なんて事をしたんだ
BACK INTO ENGLISH
I can't believe you did this.
That didn't even make that much sense in English.