Threatening someone through physical action, such as throwing a fist in their direction, or simply threatening to hit them in the face, can get you arrested for assault. Hence, words can get you in trouble. However, if you do manage to hit the other person, it is clearer that you have committed a crime. In that case, you can be charged with battery or aggravated battery, depending on the circumstances of the case. Nevertheless, whether or not that fist connects, as long as the other person reasonably thinks you are about to touch them, you have committed a crime.