Fermi and I had been given real American names for the war. Mine was 'Eugene Wagner' and Enrico's was 'Henry Farmer.' One day we were driving together along a high-security road. At the checkpoint, the military guard asked my name. I said, 'Wigner—oh, excuse me please!—Wagner.' The guard could not help but notice my Hungarian accent. He regarded me with suspicion and asked sternly: 'Is your name really Wagner?'
What could I say? I had no idea. But Enrico saved me.
The recollections of Eugene P. Wigner as told to Andrew Szanton (New York and London: Plenum Press, 1992), 237. The two physicists worked together on the Manhattan Project.