The only nation that Germany declared war on was the USA.
The German submarine U-1206 was sunk by a malfunctioning toilet.
That's not true.
The story I heard about U1206 is that the submarine took water because of a toilet problem. Water got into the engine room, getting the engines wet and releasing chlorine gases.
The U-Boat commander ordered the boat to surface, so that ventilation could occur.
When they surfaced, they opened hatches, and the U-boat was ventilated.
When they were surfaced, a British Aircraft spotted them and attacked their position, sinking the ship.
* When the US Army landed in North Africa, among the equipment brought ashore were 3 complete Coca-Cola bottling plants. Why? Because the water was disgusting. Imagine drinking water that tasted much like that of your local swimming pool. Soldiers simply favored drinking Coca-Cola. In 1939, Coca Cola only had 5 overseas bottling plants. By 1945, they had 64.
* During World War II the military production of the Ford Motor Company exceeded that of the whole of Italy. . During 1942, Ford Motor Company halted its civilian car output and shifted to total military production."
All car makers were ordered to stop civilian car production not long after Pearl Harbor (I don't have the date). The initial order wasn't so much to cause the conversion to war production, but because the access to rubber from S.E. Asia was cut off by the Japanese advance. No rubber, no tire production, and the military knew it was going to need all the rubber it could lay its hands on for tires to support the military vehicles. The automakers appealed to Roosevelt not to close down their industry, offering to make new cars without tires, arguing that the buyers could then take the tires off their old vehicles and transfer them to the new cars. Roosevelt knew, however, that once new cars started coming off the assembly line without tires, there would be tremendous political pressure to lift the ban on civilian tire production. So he didn't relent.
* The youngest U.S. serviceman was 12-year-old Calvin Graham, USN. He was wounded and given a Dishonorable Discharge for lying about his age. (His benefits were later restored by act of Congress).
* To conserve metal during World War II the Academy Awards of Merit - also known as the Oscars - were made out of wood.
* In the US in 1943, to conserve metal, the production of blades to make sliced bread was ended.