Once more, from the glories of ThinkGeek, you can own your very own plush version of this:
A Reading from the Book of Armaments, Chapter 4, Verses 16 to 20:
Then did he raise on high the Holy
Hand Grenade of Antioch, saying, "Bless this, O Lord, that
with it thou mayst blow thine enemies to tiny bits, in thy
mercy." And the people did rejoice and did feast upon the
lambs and toads and tree-sloths and fruit-bats and orangutans and
breakfast cereals ... Now did the Lord say, "First thou
pullest the Holy Pin. Then thou must count to three. Three shall
be the number of the counting and the number of the counting
shall be three. Four shalt thou not count, neither shalt thou
count two, excepting that thou then proceedeth to three. Five is
right out. Once the number three, being the number of the
counting, be reached, then lobbest thou the Holy Hand Grenade in
the direction of thine foe, who, being naughty in my sight, shallsnuff it."
— Monty Python, "Monty Python and the Holy Grail"