Greatest Video Game Weapon ever?

[Bugabear]

OF2 took the patience of a saint to play. And the campaign never let you use half the features that the game has. Like driving a boat or flying a helicopter. What was also annoying was the stupid AI. A guy just pops up. Doesn't even shoot. Just stand there. And knifing him doesnt do anything. The game also had a pretty bad physics engine but the ballistic thing was pretty cool. And of course the multiplayer didnt work.

Real life: M14/21 (mk.14) EBR with silencer and thermal sight from MW2.

Fictional: The PAX from Crysis warhead. One shot brings down the extremely annoying flying alien jellyfishes. And of course the blue Gravity gun from HL2. The Gravity Hammer from Halo 3. And the silenced scoped ODST magnum from Halo 3 ODST.