YOU SAID:
Why are you laughing like that
INTO JAPANESE
なんでそんなに笑っているの?
BACK INTO ENGLISH
Why are you so laughing?
INTO JAPANESE
どうして 笑うの?
BACK INTO ENGLISH
Why are you laughing?
INTO JAPANESE
どうして 笑うの?
BACK INTO ENGLISH
Why are you laughing?
That didn't even make that much sense in English.