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Make a small hole in the bottom of a small cottage cheese container. (Any similar container will do.) Make it near the edge. Put some cotton in the bottom and the container will be ready. To fool your friends, paint the first finger of one hand with poster paint. Stick your painted finger through the hole and bend it inward. Let the rest of your fingers grip the container naturally. Arrange the cotton around your finger to hide the hole. Cover the container and ask one of your unsuspecting friends to remove the lid. When he does, move the finger up and down. He'll flip.