YOU SAID:

I have a ball in my hand and im gonna throw it against your head

INTO JAPANESE

ボールを手に持って頭に投げつけてやる

BACK INTO ENGLISH

I'm gonna hold the ball in my hand and throw it at your head.

INTO JAPANESE

ボールを手に持って頭に投げる

BACK INTO ENGLISH

Hold the ball in your hand and throw it to your head

INTO JAPANESE

ボールを手に持って頭に投げます

BACK INTO ENGLISH

Hold the ball in your hand and throw it over your head.

INTO JAPANESE

ボールを手に持ち、頭の上に投げます。

BACK INTO ENGLISH

Hold the ball in your hand and throw it over your head.