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Originally Posted by WT Sharpe

.....If my theory of relativity is proven correct, Germany will claim me as a German and France will declare that I am a citizen of the world. Should my theory prove untrue, France will say that I am a German and Germany will declare that I am a Jew.
..........— Albert Einstein (1879 - 1955), US (German-born) theoretical physicist. From an address at the Sorbonne in Paris, quoted in The New York Times (16 February 1930). Several variants exist.

Given the prevailing pre-war geopolitics, he probably wasn't joking, but with the benefit of hindsight, it's certainly amusing now.