1) how to drain those new supadupa WiFi security cameras.
The crims just set a WiFi transmitter polling the device, which has to "acknowledge". Given enough time it drains the battery.

2) stealing from cars
the crims just blast the area which swamps the reception when idiots walk away zapping the fob behind their back. Crims return in the dead of night and take whatever is worth it.

3) lock the user out of on-line credit card access. Time for my new credit card! Probably over zealous security, but the phone calls cost more than any cashback I ever earned. Time to test the "cash" society. What are my chances?