In the Breaking the Bank at Caligula's mission, after you have the parachute intentionally miss the helipad and instead aim for the ground. On the ground, almost everyone will be driving a Turismo (the fastest car in the game). Steal one and go to the airstrip. Park the Turismo in the garage and finish the mission. Alternately, collect 20 vehicles for the Import/Export dock to get the Turismo.