YOU SAID:
I can’t believe you did that, you idiot.
INTO JAPANESE
君があしたことなんて信じられないよ、お前はバカだ。
BACK INTO ENGLISH
I can't believe you've been there, you're stupid.
INTO JAPANESE
君がそこにいたなんて信じられない、お前は愚かだ。
BACK INTO ENGLISH
I can't believe you were there, you're stupid.
INTO JAPANESE
君がそこにいたなんて信じられない、お前は愚かだ。
BACK INTO ENGLISH
I can't believe you were there, you're stupid.
That didn't even make that much sense in English.