I saw a boat once: "Last Dam Boat II"
and one here (in the same font as on the cover of Hitchhiker's Guide to the Galaxy: "Don't Panic" (upside down).
I was working at a marina once and was removing the name on a power boat
the "Brass Ring" I got a couple of letters removed went to lunch, and as I was returning from lunch walking back down the dock, I noticed that there was an ugly brown boat at the dock the "ass Ring" ..... oops, I finished removing the name before my boss noticed
There is a big power boat here with a swim platform and a door in the transom to get to it. The boat is the "Salty Lass", but the owner usually leaves the door open, making it the "Salt ass"