Donald Kennedy's amazing custom Operation game is fully functional. It features Guts Man, a character from the Mega Man video game series. He writes:

I used an Ironman Operation game for the little pieces ,the graphics for the cards, and the frame for the game. I used wire to line the holes for the pieces and I just wired the old Operation insides to work with this. I damaged the cards and money to match the stressed look of the board.

Link and Etsy Link -via Technabob