Make a loud noise of hitting the space bar over and over again until you see that your neighbor is noticing. Then look at your neighbor's keyboard. Hit his/her delete key several times, erasing an entire word. While you do this, ask: "Does your delete key work?" Shake your head, and resume hitting the space bar on your keyboard. Keep doing this until you've deleted about a page of your neighbor's document. Then, suddenly exclaim: "Well, who would have known? I've been hitting the space bar this whole time. No wonder it wasn't deleting!" Print out your document and leave.