Three in One Oil

 Way down in the out ports of Newfoundland, Murph's old lady had been
 pregnant for some time and now the time had come. He brought her to
the doctor and the doctor began to deliver the baby.

      She had a little boy, and the doctor looked over at Murphy and
said, "Hey, Murph! You just had you a son! Ain't dat grand!!" Murph
got excited by this, but just then the doctor spoke up and said, "Hold
on!
  We  ain't  finished yet!"    The doctor then delivered a little
girl. He said,  "Hey, Murph! You got you a daughter!!!! She a pretty
lil ting,too...." Murph got kind of puzzled by this and then the
doctor said, "Hold on,we  still
  ain't got done yet!" The doctor then delivered another boy and said,

   "Murph, you just had yourself another boy!" Murph said to the
doctor, "Doc, what caused all of dem babies?"
   The doctor said, "You never know Murph, it was probably something
that happened during conception." Murph said, "Ah yeah, during
conception"

 When Murph and his wife went home with their three children, he sat
down with his wife and said, " you remember dat night that we ran out
of Vaseline and we had to use dat dere 3-in-1 Oil." She said,
  "Yeah,I remember dat night" Murph said, "I'll tell you, it's a
fookin'  good thing we didn't use dat WD-40!!"