You know, piezo barbecue igniters produce a nice fat high-voltage spark...
Alternately, start sticking probes from a taser in interesting places on that chip. Won't stay working long, with no real external sign of damage.
But I think the people to answer this question are white-hat RFID hackers - the sort of people building keyless door locks and getting microchip implants for fun, or to do it first; the people sending letters to Mobil warning them Speedpass is easy to sniff, if anyone cared.