It is unlawful to throw a ball at someone's head for amusement.

The Law Explained

In an effort to curb rowdy street behavior and violent carnival games, state law includes broad provisions against throwing projectiles at a person's head. This was historically aimed at troubling street games where people threw objects at one another for cheap entertainment. While dodgeball in a gym is safe, throwing a baseball at your buddy's hat on the sidewalk could theoretically land you in trouble.