Another German gem, the Amphicar is the only amphibious passenger car ever made available to the public. President Lyndon Johnson kept one at his Texas ranch. He’d play tricks on unsuspecting guests by veering toward a lake and yelling “The brakes don’t work! We’re going in!” He’d laugh when the car then floated onto the water. The Amphicar reached 70 miles per hour on land and seven miles per hour on water. Unfortunately, the Amphicar battled the one major problem that can sink a floating automobile—leakage.