Responding to an ad for Bible salesmen, a man arrived for his
  interview and said "I w-w-want to s-s-sell B-B-Bibles."
    Naturally, the interviewer was doubtful, but hired the man
  based on his references.
    To everyone's astonishment, the fellow shortly had the best
  sales record in the office.  A meeting was called of all of the
  salesmen where he was to explain his technique.
    "It's easy.  I just go to the d-d-door and say 'W-w-would you
  like to b-b-buy a B-B-B-Bible, or I c-c-could c-c-c-come in and
  read it t-t-t-to you."