I just posted a letter to my own house.
The reason being, I wanted to ask a couple of questions of the previous owner, but he didn't leave a forwarding address. He said he'd put postal redirection in place, though, so I thought the simplest way to get in touch with him would be to post a letter to him at his old address, and trust the redirection to get it to him :-)
I actually got the idea from a computer virus which a computer of mine caught some time around the mid-1990s. When I took it apart to see how it worked (and, more importantly, what it might have done to my machine) it turned out to be using a trick very similar to this as a means of saving space.