Amphicar
It is popularly believed that the Amphicar was a ridiculous car and an even more lousy boat. It was reasonably agile on land, and painfully slow in water, with a top speed of just 7 mph. Its single greatest shortcoming was the bilge pump’s ability to keep up with leakage. If it could not, the Amphicar would became the world’s most aerodynamic anchor. However, amphicar enthusiasts have managed to keep the nearly 4,000 cars built between 1961 and 1968 still functional on the road and/or water.