Actually, this is not a joke.
According to some friends who knew the Marine guards, this was an actual event that occured while I was stationed there. (Quite a few years back).
Unfortunately, I also heard the Marine was chewed out for his “off the cuff” comment.
According to legend, when Mel Brooks was at the Battle of the Bulge the Nazis began a psy-ops offensive, asking for Americans to surrender over loudspeakers. Brooks responded by loudly performing an entire set of classic vaudeville songs back at the Nazis.