What is the definition of Postage Experiments?

Postage experiments are like the wild west of mail delivery, where the only rule is that the postman might just start a small rebellion against the postal service! Picture this: A group of postmen, tired of delivering the same old stamps, decide to turn up the heat. They start leaving handwritten notes on mailboxes, complete with cryptic messages that could only be deciphered by the most clever recipient. Then there's the unsettling example sentence: "The postman, in his quest for a more exciting job, started experimenting with sending love letters instead of parcels."