YOU SAID:
casey neistat is a cave person
INTO JAPANESE
ケーシー neistat は洞窟人です。
BACK INTO ENGLISH
Casey neistat is a cave man.
INTO JAPANESE
ケーシー neistat は洞窟の男です。
BACK INTO ENGLISH
Casey neistat is a cave man.
That didn't even make that much sense in English.