Nuke: It doesn't just make a mushroom cloud, it actually has an explosion time of 1:00 minute and it blows a feirce wind to knock anything down within a 500 meter radius.
Black Hole Generator: Ok, a litttle 2100itish, but you gotta admit, it's a good idea, same concept of nuke, no wind, it sucks everything up within a 500 meter radius, then after one minute the black hole turns into an instant nuke.
Sack: A simple paper lunch sack that substitutes for a smoke 'nade
Cell Phone: It can be used to disable all vehicles in a mile radius of the player holding it.
Lastly, The Parker: A soda can with a metal rod sticking out, click to pull the rod, throw it at any structure will collapse.
I hope somebody makes at least some of these weapons.