Just when I thought I had seen enough of my own shortcomings, I managed to surprise myself by fully posting a letter without any address on the envelope whatsoever. I now know I am solely responsible for and behind this deed, as the local Post Office has been kind enough to open the letter, pick up my own address from the top right corner and post it back to me. And confront me with more than sufficient proof of my own absent-mindedness.
LOL. LOL. LOL.