I love brain teasers and quizes. When I was in Navy basic they gave our class a test. One question which most all the class missed was this one: If the ladder on a ship had 4 rungs above water and each rung is spaced exactly one foot, how many rungs will be above water in 3 hours if the water rises 1 foot an hour? I am proud to say I was one of the few who got this one right.