Sensitive data is no match for the Rfiddler rifle. It can burn out RFID tags and USB sticks by zapping them with a strong electromagnetic field generated by a hacked 0.6kJ photo-flash unit driving a 50 turn copper spool.
So, in addition to frying data, the resulting flash from the gun will also fry your retinas. It even has a built-in MP3 player with a 2-watt amp for sound effects. Needless to say, if you do decide to build something like this, I wouldn't go aiming it at credit cards, hard drives, passports or living creatures. Hit the following link for instructions. [codeninja via Hack a Day via Technabob]