"Hey, that's weird," said Fred, frowning down at the Map as he leaned against the wall. George was a few feet from him, scanning the wall for the entrance to a secret passage the Map indicated would lead down several floors from the Defense classroom down to Transfiguration, which would save them a walk on Tuesdays and Thursdays. More importantly, it would confuse and impress the rest of their classmates, which was of course the point.