A game introduced to the site by Thermopylae, in which concepts (usually in the form of images) are one-upped.
Also called One-upmanship.
A recent example by Thande and Gryphon involved the following one-ups:
Cthulthu beats chemistry
Grinning Thande beats Cthulthu
Battleship beats grinning Thande
Submarine beats battleship
Depth charge gunboat beats submarine
Torpedo bomber beats depth charge gunboat
Surface to air missile launcher beats torpedo bomber
Challenger 2 tank beats surface to air missile launcher
Helicopter gunship beats Challenger 2 tank
Avenger anti-air laser from C&C Generals beats helicopter gunship
and simultaneously -
Linux penguin beats grinning Thande
Microsoft Office paperclip beats Linux penguin
Blue Screen of Death beats Microsoft Office paperclip
Service Pack 2 beats Blue Screen of Death
“Stop: Hammer Time!” dialogue box beats Service Pack 2
Firefox popup blocker beats dialogue box
BSD daemon beats Firefox popup blocker
Angel beats devil
At which point the game was called off due to Thande's recursion to C&C.