Since I've just mentioned Martin Gardner (previous post) might as well put up one of his old, simple 'Gotcha' puzzles again (I've re-written it):6 students make a reservation at their favorite pizza palace, but just as they are about to leave a 7th student decides to join them. When they all arrive, the hostess realizes there are 7 students, yet she has only set up a table with 6 seats. Still, no