Glory be to the Murder Cube.
Originally an attempt at a gun gore thread (thread where people dump pics of guns being destroyed), it quickly went memetic after somebody referred to it as the "Murder Cube". Immediately afterward several writefags posted backstories for the cube, fueling the flames. By the end of the day /k/ had worked out a fairly consistent, pseudo-religious fluff for the Murder Cube (borrowing heavily from Warhammer 40k's Khorne, among other things). Since then, every time it comes up again it's met with a few cries of "Glory be to the Murder Cube" etc. It should also be considered as the 'Mecca' of operators, with tens of neckbeards and faggots alike flocking to the marvelous tribute to death and destruction.
Original thread can be found here: http://chanarchive.org/4chan/k/33122/