There is a poem named "Post" by Samuil Marshak, written in 1927. The poem tells a story of a letter being sent from Rostov to Leningrad. The addressee, Boris Zhitkov (another writer) was not found at home as he had left for Berlin. The letter, apparently automatically is sent to Berlin. There, it turns out, he left for London, so the letter goes to London, where it turns out he left for Brasil. The letter (being considerably rumpled already) goes to Brasil, where it turns out he returned to Leningrad. So, the letter goes back to the USSR so to find the very surprised addressee there. Finally Zhitkov expresses admiration of the postal services that made the letter to cross the whole globe in search for him.
So, I wonder whether the poem is based on real service that could be offered in 1927?