I hope it is not to tastless but this is my all time favourite ww2 joke.
Hitler and Goering were arguing about the Jews, Goering stating that they were quite clever people and Hitler vehemently denying they were any such thing.
Finally Goering told Hitler that they should go out in the city and Goering would show Hitler it was true. Hitler agreed, so they disguised themselves and went out on the street.
Goering took Hitler into a shop, went up to the counter, and asked the clerk: "Do you have any left-handed teacups?" The clerk stared at Goering for a moment and then said no, mein herr, I do not.
The two left with Hitler complaining that he did not understand what the point of this was and Goering telling him to be patient. They went to another shop and Goering gave the same act: "Do you have any left-handed teacups?" The clerk stared and shrugged his shoulders.
They left with Hitler becoming incensed over this nonsense and Goering begging for patience. Finally they went into a Jewish shop; Goering again asked the clerk: "Do you have any left-handed teacups?"
The clerk smiled graciously, went into the back room and made a show of rummaging around, brought out a saucer and teacup, set down the saucer, and carefully placed the cup with the handle pointed so Goering could pick it with his left hand. "There you are, mein herr!" the clerk said.
Goering bought the teacup, thanked the clerk, and the two men left. Goering turned to Hitler and said: "See, I told you the Jews were very clever people."
"I don't see what was so clever about that," Hitler snapped. "He just happened to have one in stock!"