Strange things happen

The most strange and funny thing has happened with me.
I usualy send my mail from the main post-office in Moscow. I think it is more safe and fast. But last several times I used the mail-box near my railway station. There I put the letter to a friend which photos I showed here at the beginning of August.
Today I got it back. But not because it was mis-sent or address was wrong. No! they just considered my address as an address of receiver! And it doesn`t matter that there are lots of stamps, sticker "via air mail" and that my adress was at the other side of the envelope. O_o
I was surprised! And had nothing to do but put this envelope to another one and send it again...