I once found a letter addressed to "Kefka" shoved in my mailbox. Since it had didn't have a stamp, that would mean that it was hand-delivered, likely slipped under the door. A neighbor probably noticed it and placed it in there (Had my first name on it.)
Trolled.
Oh it was quite amusing, until I realized that bad stuff could have gone down if I had caught the person. It read like a Mission: Impossible briefing, of this organization being pleased with my work, and that I would be contacted with the 'jack dual.' If I find it I'll post pix.
I narrowed it down to a few suspects...
I seriously hope I didn't lose the letter. It'd be great for the Trollinomicon.