After doing some research into new technology trends, the filmmakers commissioned conceptual artist Christopher Ross to illustrate a few updates on the legendary tool. This super-knife includes a tiny flame-thrower, a blowgun that fires darts loaded with deadly venom, and a fold-away harpoon. That last feature seems to be Segal's favorite. "A little cross-bow fires mini-harpoons connected to sixty feet of spider silk nanothread with the strength of half-inch steel cable," he says. Honestly? Well, sort of. Segal says that the prototype blowgun and harpoon based on these sketches really did fire—but not spider silk.