Car and Driver, years-ago, did an article on South African police who were dealing w/the robberies of people in cars, including carjacking. The robbers often went to their local witch doctor for 'potions' to make them invisible to police, invulnerable to their bullets, and other such 'aids.' The local car modification companies offered varying levels of car armoring, and offensive gadgets like a James Bond Aston Martin DB5 from Goldfinger. These included spray nozzles for dispensing tear gas, but my favorite were thick steel bars that shot-out from the rocker panels. Stepping on the gas once these were deployed would cleanly cut-down anyone standing next-to the car, shattering their ankles, and possibly much-worse, just imagine.
Guess that 5.56 mm gatling minigun would require a FFL license...