One of the groaniest ones I've heard was from an old BBC TV show that majored on wordplay (I forget its name). I found this version of it somewhere:

William Penn, the founder and mayor of Philadelphia, had two aunts,
Hattie and Sophia, who were skilled in the baking arts. "Big Bill"
was petitioned by the citizens of his town because the three
bakeries in the town during the Revolution had raised the price of
pies to the point that only the rich could afford them.

He turned to his aunts and asked their advice. The wonderful old
ladies were so incensed over this situation that they offered to
bake 100 pies and sell them for 2 cents lower than any of the
bakeries were charging.

They were not only successful in bringing the price of pastry
down in Philadelphia, but they established an historical item for
the reference books.

To this day, scholars still remark about the remarkable
pie rates of Penn's aunts.

(with apologies to Gilbert and Sullivan)