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Here is a renegade method to making a device that can destroy passive RFID tags permanently. Best of all, it is cheap as hell. It mostly consists of parts from a disposable film camera. The premise behind this creation is for protection. According to the site, RFID is the next big thing that will be able to track every step you make, so nuke all of those RFIDs and know that your paranoia is potentially safe for one more day. The zapper works like a microwave oven, generating a small EMP field that will disable all RFID tags within a certain area. Gizmodo is not responsible for any damages you do to yourself or other products that may result in legal action.

RFID Zapper[Via Redferret]