Grindhouse is a Double Feature from Quentin Tarantino and Robert Rodriguez. In the Planet Terror segment of Grindhouse Rose McGowan's character Cherry has a machine gun leg. In most of the promotional materials for the film, Cherry's left leg is the gun, but in the film, it's actually on her right leg. Was it a conscious choice to screw up on purpose?
It must have taken a long time and lots of drugs to settle on a machine gun leg. The examples below are of other items considered for her leg, but ultimately rejected. Including a cane, blender, zombie leg in a cast (so the zombie can't spread), a chain saw (which would rock, because she could turn it on and use it like a wheel), a dyson vaccum, lawnmower (throwback to Dead Alive), and finally a miniature version of The Bride from Kill Bill.