Full name: The Holy Hand Grenade of Antioch.
A reading from the Book of Armaments, Chapter 4, Verses 16 to 20:
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, shall snuff it."
From Monty Python and the Holy Grail, scene 21: The rabbit of Caerbannog