The Holy Hand Grenade

"...the number unto which thou shalt speak shall be 3 and no man shall hold the Holy Hand Grenade unto a count of 4.  Woe betide to that man who shall in haste deliver upon the count of 2.  Beware to he who is so foolish to tempt the wrath of God by a a count of 5, damned is he who reaches 6 and 1 is just plain silly.  No the number before throwing to which you shall count will be 3, not 4, nor 2........"

Paraphrasing from Monty Pythons "The Holy Grail"