YOU SAID:

I can't believe you've done this; you fool.

INTO JAPANESE

私はこれをやったなんて信じられない馬鹿。

BACK INTO ENGLISH

I can't believe I did this idiot.

INTO JAPANESE

こんなの信じられない

BACK INTO ENGLISH

I can't believe I did this.

INTO JAPANESE

こんなの信じられない

BACK INTO ENGLISH

I can't believe I did this.