San Francisco Giants ace pitcher Matt Cain appeared on an episode of Mythbusters recently and the crew wanted to see if Cain could knock things out of the sky using only his arm and baseballs. A kind of human skeet gun. It sounds tough, but when you're talking about a guy who can throw a baseball in the mid 90 mile per hour range within an inch or two of where he wants it to go, it's probably not outside the realm of possibility.
You don't need to take my word for it, just watch the video. But it's not just skeet targets getting tossed out there, there's things like a watermelon. Pretty impressive stuff.