for wit and orginality alone this one deserves to do well. humour is definitely appealling. Equally appealing is the geometric and seemingly simple appearance of the picture. not 100% sure if this satisfies the SDOF angle of the challenge, but I'm giving it a 9 anyway.
I like the idea: find the execution of it a bit lacking however; somehow the impact of that single reversed switch has been lessened - probably by your choice of crop and composition. The obvious placement would, of course, have been to exclude the left-most switch entirely, which would have given the odd one out a stronger position within frame - however, as you've also cropped across the right-most switch, I guess you were trying for an impression of continuity - as though there were a vast bank of these switches. I think also you could have been more creative with your lighting - the first thing I'd have tried would be some kind of soft light from beyond the switches - to give a greater degree of light and shade to the individuals - basically, more contrast. That said, you've achieved a suitably anti-septic, 'scientific' feel here, which is by no means out of place - I just think that you could have used the reflectiveness of the surface to good effect also. DOF os effective, though in an ideal world might have been even shallower - but I guess one doesn't necessarily have the means ... definitely an above-average shot, though. 6 from me, for now.