Elon Musk: I could cause a good amount of damage to an electric motor without equal effort. Oil and lubrication, oil and lubrication systems are not only vulnerable, but you also easy to sabotage. Water, urine, wine, or any simple liquid can dilute gasoline fuel to a point where it's no longer combustible. Here's one jam paper bits of wood hairpins and anything else that will fit into locks of all unguarded entrances to public buildings.