
Strangelove
Agree on the doomsday device, although we can possibly just say the bomb that Slim rides at the end could work as well.
Also:
GhostBusters - those backpacks. Bad ass
Army of Darkness - Some good Evil Dead points, but I'm going for Ash's shotgun ("This is my Boom-stick!")
Orgasmo - the Orgasmatron, or whatever its called. Funny movie, classic weapon.