But watch Johnny Matheney effortlessly arch and extend each finger on his bionic arm and you can't help but agree with him when he says: "The future is coming now."

Its makers describe Matheney's robotic limb as the most sophisticated of its kind in the world, recreating virtually every movement of a natural arm -- and all controlled by brain power.

"When they took my arm I never thought I would have an actual hand -- I saw the hooks and thought that was exactly what I would be getting," said Matheney, who lost his left arm to cancer in 2008.

"So once they introduced me to this, it was like something out of space come to Earth."