It happened when the former US President Jimmy Carter visited the DPRK in summer of 1994.
President Kim Il Sung had a conversation with his American guest on a barge on a voyage down the Taedong River. After a while, he called one of his suite and asked him to have the ship slowed down.
Carter wondered at the ship beginning to lose its speed and asked the host why it was moving slowly.
The host, pointing to some anglers at one side of the river, said that if their ship ruffled the water at a fast speed, it may bother the anglers. He added that they would better sail a bit slower for the anglers convenience.
The American guest was impressed by his hosts saying.