A few years ago, I went to Seattle, and took lots of pics (which, come to think of it, I might submit to my photo account). A few months ago, I found a pic I took from there of a sign that said 'To Ferries'. Out of boredom, I did a quick and subtle photo-edit to the sign - a simple (though somewhat awkward) switching out of letters that completely changes the sign.

You know, a sign like this might be convenient for a con. :p