A gun that shoots a laser-boomerang.
Cuts through anything, including people, and you control it with the analog stick/mouse/whatever, so it's rather badass, however you have to wait for it to come back to the gun before firing again.
You can speed up the boomerang with the right trigger/a key on the keyboard, and this of course makes reloading happen sooner, but makes you less accurate at cutting bitches and hoes due to the speed at which you are directing the laserang.
Second, a gun that takes away one section of scenery/environment, which can do lots of things, such as cause enemies to fall to their death from the lack of platform, or lose cover, or remove armour on a tank, etc.
That same piece can then be placed again somewhere else, for your benefit, such as making a platform, or cover.