Bosch plugs falling apart....

We had this happen to a friends Wrangler after a fresh tune up. The ground straps fell off two plugs and he shut it down right away. We bore scoped the two cylinders and found that the straps blew out the exhaust valve. The plugs went back to the parts store and were exchanged for Champions. A few weeks later we got a letter from Bosch claiming that the bosch plugs we used wern't made by Bosch but were Chinese knock offs. Whatever!