Growing up in Minnesota, I heard many "Ole and Lena" jokes about the Scandinavian immigrant community.
On business in Norway, I found that these jokes were totally unknown there, so I had an audience.
Later, I met a rather spectacular young blonde at O'Hare, who was traveling from North Dakota to Hawaii to represent her state at the "Miss Hawaiian Tropic" contest (no longer politically correct).
She was very surprised to find out that these jokes were unknown in Norway.
Example:
Ole (the Norwegian) and Bjorn (the Swede) go to the barber, and Bjorn is served first. The barber asks him if he wants some pomade in his hair, and he replies "No thanks. My wife says it makes me smell like a French bordello."
When the barber asks Ole the same question, he replies "Sure. My wife doesn't know what a French bordello smells like."