A conceptually excellent photo. Funny and witty. Great delineation of texture and the black white works very well. Good choice of pistachios as the 'real' nuts, with the way they pop open.
I feel the composition is just a bit busy. You have used DOF well to isolate the metal nut from the others but i feel it might need a little something more to get it more distinct. It might have helped for your light to catch high light on the metal nut instead of leaving it dark.
Or maybe use a spotlighting effect (cone of paper over a desklamp works well) to single out the metal nut, while leaving the pistachios darker.
Overall a fine effort, and one you should be proud of :).
Hehehehe! My type of humor. And a great pic at that! Well done and cropped! Great focus on the nut (uhhh... the metal one ;o)). Lighting is perfect. A well deserved 8
Love the play on words. Think it would have stood out better in color though. But then you may not have wanted it to jump out at you, rather it be subtle. Anyway, good shot. PTL
Great Idea. The challenge was met. I think I would like to see some colour. My eyes keep wandering to the nuts in the front of the picture that are out of focus...but it does make the metal nut stand out. Good job.