Building and maintaining the tennis venue at Wimbledon is expensive, so starting in the 1920s, the All England Lawn Tennis and Croquet Club sold bonds to investors. But buyers don't get money; they get tickets. They can sell these tickets freely on an open market and thus earn a profit:
Link -via Marginal Revolution | Photo by Flickr user acme used under Creative Commons license
The club has issued these since the 1920s to finance development. But instead of paying cash coupons, like regular bonds, Wimbledon debentures pay interest in something much more valuable: tickets.
Holders get one ticket for each day of the Wimbledon tournaments during the five-year life of the bond. And here is the kicker: If you don't feel like going on any given day, you can sell it—legally.
"They're the only tickets that are freely tradable on the open market," says All England Finance Director Richard Atkinson. "You are free to sell them to anyone you like."
Link -via Marginal Revolution | Photo by Flickr user acme used under Creative Commons license