An Irish postman was able to deliver a letter with no written address, but had a hand-drawn map of the delivery area with “Here please” written on an arrow pointing to an illustration of a lighthouse. The letter had been sent by a blogger who regularly challenged the postal service.
In 1930 the US government barred and returned any mail from Spain bearing a new set of stamps, which showed a world-famous painting of a naked woman.
There is a staffed underwater post office where people have been mailing postcards for years.
After parcel post service was introduced in 1913, at least two children were sent by the service. With stamps attached to their clothing, the children rode with railway and city carriers to their destination. The Postmaster General quickly issued a regulation forbidding the sending of children in the mail after hearing of those examples.