The BBC

In order to screen and "protect" the Dutch from the "Jewish, Bolshevik lies" that the British Broadcasting Corporation (BBC) was said to be putting on the airwaves, the Nazis introduced jamming stations on the same wavelength. When this did not stop the people from listening, they ordered the Dutch to hand in their radio sets. Now - even before the war - such sets were luxuries, only 2 out of every 5 Dutch families owned one, and by no means all of them were delivered to the Nazis. They were hidden and used, not only to listen to the news from England, but also to some of the normal radio broadcasts. Favourite BBC programmes were the almost daily performances by Glenn Miller's Army Air Force Band and Music While You Work.

If a crowd of Dutchmen gathered - whilst waiting for a canal bridge to open for instance - and someone started whistling Moonlight Serenade or some other American or British hit tune, soon the whole crowd joined in.

But, of course, no one had a radio set anymore. . .