YOU SAID:
hey what the heck do you think you are doing man
INTO JAPANESE
ねえ、一体何をしていると思いますか?
BACK INTO ENGLISH
Hey, what do you think you're doing?
INTO JAPANESE
おい 何の用だ?
BACK INTO ENGLISH
Hey, what do you think you're doing?
That didn't even make that much sense in English.