OUTBOARD MOTOR
Useful for propelling a boat (see Boats) but I would also imagine it would be quite fun to start one up and then stick it in a zombie’s face thus blending its head. Or that may just be taking the whole art of zombie killing just a little too far. With that in mind, though, if you don’t have a blender to make your morning smoothie, you could always use a bucket and an outboard motor. Or a power drill in a jug.