“Fischer’s Fritze fischt frische Fische,
frische Fische fischt Fischer’s Fritze.”
This is one of the most famous German tongue twisters, though by far not the most difficult one.
The translation is something like this:
“The fisher’s Fritz catches fresh fish,
fresh fish catches fisher’s Fritz.”
By the way:
Fritz is a name, a short form of Friedrich, and it might refer to the fisher’s son, but it’s not entirely clear.