Rocks fall, everyone dies
"Rocks fall, everyone dies" is a method of ending a campaign commonly used by angry DMs who have gotten fed up with their players' bullshit. In this situation, the characters are arbitrarily killed by some unavoidable fate such as an avalanche or a cave-in (the titular rocks falling) and the DM declares this the end of the game.
This was used in the ending of the NWN2 original campaign. And at the beginning of the first Icewind Dale game, killing everyone that isn't the player party. In theory, this may have been inspired by Tomb of Horrors, in which entering the wrong room CAN lead to "Rocks Fall" everyone dies...if you don't leave within 10 seconds.
Another varient on this is the "Rocks fall, you die. Everyone else levels up." as in DnD players can earn XP from witnessing events that no-one has ever seen before. So you bullshit the players with a story about how magic is created by meteorites of pure magic falling through the atmosphere and as they burn up the microscopic dust suffuses everything and creates magic.
So players are walking along, one player is being a cock, magical rocks scream out of the sky and flattern them and due to the beauty and amazement of seeing something like that everyone else in the party levels up.
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The original appearance of the "Rocks fall" phrase, according to Twenty Sided Blog.