Is it really?

My brothers and my exam are finish!I have ready to wacth a movie at cinema,but I can't(2012).I heard 2012 is a movie about the end of the world.All of the disaster will happen at that year(SCARED~).After our delicous dinner,I am puzzled and I ask my father:"Are our's leg have magnet?Grounds are S,our legs are N.My father said:"Why head not be atracted to the floor?"I said because head is S!When I went home,I remember:But why some people can use its head on the floor?