16. Molecular Accelerator / Arrestor
Crysis may be known primarily as the game with graphics so good your PC can't even run the title screen, but it's the weapons that kept us coming back. Primarily, the Molecular Accelerator, or MOAC, which quickly froze moisture in the air around it to shoot deadly icicles like gatling fire.
Even better was the upgraded version, the Molecular Arrestor (MOAR), which fired a continuous stream that flash-froze enemies, vehicles and pretty much everything else. You could freeze a helicopter in mid-air and watch it tumble to the ground, exploding into a million icy shards on impact.