Dobby’s enormous, tennis-ball-shaped eyes were wide; he was trembling from his feet to the tips of his ears. He was back in the home of his old masters, and it was clear that he was petrified.

“Harry Potter,” he squeaked in the tiniest quiver of a voice, “Dobby has come to rescue you.”

Harry Potter and the Deathly Hallows – J.K. Rowling