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LAUNCELOT:  We have the Holy Hand Grenade.
ARTHUR:  Yes, of course!  The Holy Hand Grenade of Antioch!  'Tis one of the
  sacred relics Brother Maynard carries with him!  Brother Maynard!  Bring up
  the Holy Hand Grenade!
MONKS:  [chanting]  Pie Iesu domine, dona eis requiem.  Pie Iesu domine, dona
  eis requiem.  Pie Iesu domine, dona eis requiem.  Pie Iesu domine, dona eis
  requiem.
ARTHUR:  How does it, um-- how does it work?
LAUNCELOT:  I know not, my liege.
ARTHUR:  Consult the Book of Armaments!
BROTHER MAYNARD:  Armaments, Chapter Two, verses Nine to Twenty-one.
SECOND BROTHER:  And Saint Attila raised the hand grenade up on high, saying,
  'O Lord, bless this thy hand grenade that with it thou mayest blow thine
  enemies to tiny bits, in thy mercy.'  And the Lord did grin, and the people
  did feast upon the lambs and sloths and carp and anchovies and orangutans
  and breakfast cereals and fruit bats and large chu--
MAYNARD:  Skip a bit, Brother.
SECOND BROTHER:  And the Lord spake, saying, 'First shalt thou take out the
  Holy Pin.  Then, shalt thou count to three, no more, no less.  Three shalt
  be the number thou shalt count, and the number of the counting shall be
  three.  Four shalt thou not count, nor either count thou two, excepting
  that thou then proceed to three.  Five is right out.  Once the number
  three, being the third number, be reached, then lobbest thou thy Holy Hand
  Grenade of Antioch towards thy foe, who, being naughty in my sight, shall
  snuff it.'
MAYNARD:  Amen.
KNIGHTS:  Amen.
ARTHUR:  Right!  One... two... five!
GALAHAD:  Three, sir!
ARTHUR:  Three!
  [angels sing]
[boom]

Tirado daqui: http://faculty.smu.edu/bwheeler/kinga/mpgrail.txt