Case File: Khnum vs. Egypt
Case Description: Khnum is accused of having a monopoly on Nile river mud. Since he once ruled all the waters of the land, he keeps all of the river clay that he can for himself and doesn't allow others to take their fair share.
Case Status: Settled. Khnum showed the people of Egypt that there's tons of mud to go around—by throwing it at them. Hence the phrase "mudslinging."