5 Famous Sci-Fi Weapons That They're Actually Building

This is a really cool article at Cracked. As a big sci-fi fan though, all I ask for is a real honest-to-god death ray. No, I'm not advocating more war and greater bloodshed but c'mon: tell me you wouldn't love to test this at least once! Oorah, baby!

Of course, this mobile weapon system picture here would be cool to put through its paces as well...