SEE THE PHOTO OF THe WoRLD's COOLEST RIDE-CAR WiTH. SWIMMING POOL.

Tired of dealing with the unbearable summer heat, a 27-year-old driver from Eibenstock, Germany, had the not-so-brilliant idea to turn his BMW convertible into a mobile pool, by completely sealing the passenger cabin and filling it with water.

German police say a motorcycle cop couldn't believe his eyes when he saw four men, including the driver, splashing about in the open-top BMW as they passed him Sunday afternoon near Blauenthal, about 155 miles (250 kilometers) south of Berlin.

Chemnitz police spokesman Frank Fischer says the men pulled over and jumped into a nearby river as soon as they saw the officer, but one later returned to claim his clothes.

Fischer said Thursday that police were still investigating which of the men drove and whether he was drunk. He said the vehicle itself "probably didn't have a road permit."