Cure for constipation
A chap walikng his dog on the North Yorkshire Moors came across a fern that he hadn't seen before. He picked some leaves, or fronds as they are called on ferns, and took them home.
Experimenting with them at home, he discoverd that if he boiled the fronds, the liquid cured constipation when drunk. He contacted one of the major medical companies, and they found it really did work. They are now producing and selling it in commercial quantities. It goes with the slogan (With fronds like these, Who needs enemas)