What sarcastic remark does Ralph have in response to what Simon says in Chapter 7?

At the beginning of Chapter 7, Ralph peers out into the vast Pacific Ocean on the far side of the island and is filled with a feeling of hopelessness. Ralph wishes that he could go home but highly doubts that he will ever be rescued. As Ralph ponders about the impossibility of being rescued, Simon walks up behind him and says, "You'll get back to where you came from" (Golding 159). Initially, Ralph is confused as to what Simon is talking about, but after Simon repeats himself, Ralph makes a sarcastic remark by saying, "Got a ship in your pocket?" (Golding 159). Ralph then looks at Simon and says that he is "batty." Despite the fact that Ralph thinks that Simon is odd and weird, he is encouraged by Simon's optimism. Simon's comment also foreshadows Ralph's eventual rescue at the end of the novel. Shortly after Simon tells Ralph that he will make it home, the group of boys head out on a hunting expedition.