A group of people are standing at a river bank and suddenly hear the cries of a baby. Shocked, they see an infant floating--drowning--in the water. One person immediately dives in to rescue the child.
But as this is going on, yet another baby comes floating down the river, and then another! People continue to jump in to save the babies and then see that one person has started to walk away from the group still on shore. Accusingly they shout, "where are you going?" The response: "I'm going upstream to stop whoever's throwing babies into the river