Today I learned a very short Swedish sentence:
I å ä e ö.
“In the river, there is an island.” This is particular to the Gävle region and wouldn’t be considered strictly correct elsewhere. (Not the Queen’s Swedish, as Graham would say)
However, it is a great test of vowel enunciation; if people know what you said, you win! It also uses all three extra letters in the Swedish alphabet. I think this should be first on the curriculum of every Swedish class.