Blond Builders

          Two  blond guys were building a house.  The first guy had a pouch
          of nails. He'd take a nail out of the pouch and, if it was facing
          the house,  he pounded  it into  the house.   If  it was  pointed
          toward him,  he threw it  over his shoulder.   After awhile,  his
          friend  said,  "What  are  you  throwing  those nails  over  your
          shoulder for?"

               The first  guy said,  "Well, they're  pointed toward  me, so
          they're defective."

               The  second guy said,  "YOU DUMMY!   Those aren't defective!
          They go in the other side of the house!"