OK, here's my first feeble thought: Pick up a Gillette product, the RFD snaps your picture. You move to another aisle and ditch the razor blades in the soup section and proceed to the checkout. The checkout RFDs sense a theft has occurred and alarms sound resulting in your detention for shoplifting. You refuse to submit to a search until police are present.
When nothing is found you institute a huge lawsuit, win handily and live happily (and richly) ever after.