According to family folk lore, during WWII when they had double summer time, my grandmother managed to put the clocks 2 hours forwards instead of 2 hours back.

According to family folk lore, during WWII when they had double summer time, my grandmother managed to put the clocks 2 hours forwards instead of 2 hours back. So woke up in the small hours and turned on radio to BBC and heard German (they transmitted to Germany as propaganda, and during night used channels normally broadcasting in English). Immediately wakes whole household - "we've been invaded - the Germans have taken over the BBC"!