Strolling along the beach, a woman catches sight of a young man who appears to be dancing at the water's edge. The young man bends down, straightens to his full height and then casts his arm out in an arc. Drawing closer, she sees that the sand is littered with starfish and he is throwing them, one by one, back into the sea.
She says, There are stranded starfish as far as the eye can see. What difference can saving a few of them possibly make?
Smiling, he stoops down and tosses another starfish out over the water, saying, It made a difference to that one.