I shall have to go. But-" and here Frodo looked hard at Sam- "if you really care about me, you will have to keep that DEAD secret. See? If you don't, if you even breathe a word of what you've heard here, then I hope Gandalf will turn you into a spotted toad and fill the garden full of grass snakes." Sam fell on his knees, trembling. "Get up, Sam!" Said Gandalf. "I have thought of something better than that. Something to keep you quiet, and punish you properly for listening. You shall go away with Mr. Frodo!"  "Me, sir!" cried Sam, springing up like a dog invited for a walk. "Me go and see Elves and all! Hooray!" he shouted, and then burst into tears.
J.R.R. Tolkien, The Fellowship of the Ring
dog, elves, frodo-baggins, gandalf, samwise-gamgee, secret, snakes, tears, toad