In the latter months of World War II, as the Allies were closing in on Germany, the Nazis developed a ruse that worked well for a while.
They would find German soldiers who spoke English well and dress them as Americans. They would arrange for them to be “lost” and to rejoin the Alllied forces as they moved forward. Their task: to infiltrate the American troops and assassinate Generals Eisenhower and Patton.
In time, the good guys developed some tests for exposing the fakes. One German was cut down by the Americans when they saw how he was walking. He was ramrod straight whereas all our troops slouched when they walked.
Another group learned to address the soldier using “pig Latin.” If he was stymied by that, he was exposed.
And they developed questions. Two, I recall, were: Who is Betty Grable? and What position did Lou Gehrig play?
The answers were: movie star/pinup girl and first base for the Yankees. It was understood that every GI in the world would know this.
If you have been in the warfare against the forces of righteousness and the enemies of all that is good and holy for any period of time, you have come up against counterfeits and pretenders, fakes and shams.
The question is, how do you tell? And what should we do about them?