So imagine you're playing a game with your friends and you come across a really tough monster that you can't defeat with just your regular weapons. That's when you pull out the Holy Hand Grenade of Antioch.
The Holy Hand Grenade of Antioch is a weapon from a movie called Monty Python and the Holy Grail. It's a special kind of grenade that's so powerful, it can defeat even the toughest enemies.
But here's the thing: you can't just throw it like a regular grenade. You have to follow a specific set of instructions. First, you have to count to three. Not one, not two, but three. Then, you have to say a special prayer that goes something like "Oh Lord, bless this thy hand grenade that with it thou mayst blow thine enemies to tiny bits, in thy mercy."
After you say the prayer, you can throw the grenade and it will explode in a huge ball of fire, destroying everything around it.
Now, of course, in real life, there's no such thing as a Holy Hand Grenade of Antioch (thank goodness!). It's just a made-up weapon from a silly movie. But it's become really famous and people still talk about it today because it's so fun and silly.