YOU SAID:
i'm going to freak out
INTO JAPANESE
私はびっくりするつもりです
BACK INTO ENGLISH
i'm going to surprise
INTO JAPANESE
私は驚かすつもりです
BACK INTO ENGLISH
i am going to surprise
INTO JAPANESE
私は驚かすつもりです
BACK INTO ENGLISH
i am going to surprise
That didn't even make that much sense in English.