RFID Zapper ...

RFID zapper uses electromagnetic field to over-power and disable the RFID tag, rendering it useless. ...

... "RFID-Zapper, a hacked up disposable camera that delivers an EMP of sorts to unsuspecting RFID tags ... " ...

Via Engadget: Stick it to the man with your very own RFID-Zapper ...

Link: RFID-Zapper: "The RFID-Zapper is a gadget to deactivate (i.e. destroy) passive RFID-Tags permanently. The development-team presently consists of two people (MiniMe and Mahajivana), who had some help from a friend (thank's for that). Goals are a proof-of-concept and the construction of at least one functioning and appealing prototype, ... "