YOU SAID:
Weakling, this is not a joking matter!
INTO JAPANESE
弱虫よ、冗談じゃねえぞ!
BACK INTO ENGLISH
You wimp, no kidding!
INTO JAPANESE
あなたは弱虫です、冗談ではありません!
BACK INTO ENGLISH
You are a wimp, no kidding!
INTO JAPANESE
あなたは弱虫です、冗談ではありません!
BACK INTO ENGLISH
You are a wimp, no kidding!
That didn't even make that much sense in English.