The Magic Finger — Roald Dahl

With a finger like this, you can really make a point!

The Greggs are hunters who will shoot anything in the woods for fun. The little girl who lives next door hates it. She tries to talk them out of it, but they only laugh at her -- so she turns her "magic finger" on them. The next morning, to their surprise, the Greggs wake up bird-sized, complete with wings. And before they know it, they're living in a nest, while four strange human-size ducks have taken over their house! Now the shoe is on the other foot -- and that foot is webbed.