I found reference to the National Toilet Mapping Project, as well as some sites mentioned on Very Spatial such as the map of Springfield at Humbolt University. They also have links to the Lunar Real Estate Finder which matches up any address with its corresponding place on the moon, the starwars, startrek, narnia, lord of the rings,UFO sightings…. (oh heck, its a bonanza for geeky and literary universes). Lots of geospatial fun in one place.
(Note: This post is referring to a nice directory of unusual maps on the Humboldt State University Library website)