Polish jokes were actually created by the third reich.
I'm pretty certain they were around well before that during the big immigration from Eastern Europe 1890-1910 or so, particularly in the coal regions.
Non-Jews of Polish descent suffered over 100,000 deaths at Auschwitz. The Germans forcibly deported approximately 2,000,000 Polish gentiles into labor for the Third Reich. The Russians deported almost 1,700,000 Polish non-Jews to Siberia.
http://www.remember.org/forgotten/
On August 22, 1939, a few days before the official start of World War II, Hitler authorized his commanders, with these infamous words, to kill "without pity or mercy, all men, women, and children of Polish descent or language. Only in this way can we obtain the living space [lebensraum] we need".
Heinrich Himmler echoed Hitler's decree: "All Poles will disappear from the world.... It is essential that the great German people should consider it as its major task to destroy all Poles."
Non-Jews of Polish descent suffered over 100,000 deaths at Auschwitz. The Germans forcibly deported approximately 2,000,000 Polish gentiles into labor for the Third Reich. The Russians deported almost 1,700,000 Polish non-Jews to Siberia.
http://www.remember.org/forgotten/
On August 22, 1939, a few days before the official start of World War II, Hitler authorized his commanders, with these infamous words, to kill "without pity or mercy, all men, women, and children of Polish descent or language. Only in this way can we obtain the living space [lebensraum] we need".
Heinrich Himmler echoed Hitler's decree: "All Poles will disappear from the world.... It is essential that the great German people should consider it as its major task to destroy all Poles."