As a counter to the interesting boats thread, How about an Unusual Floating Objects thread? Things seen either in real life, craigslist, or other advertising?
For an example:
2000 Midship Marine Semi Submersible Power Boat For Sale - www.yachtworld.com
Nothing in it's description says the hulls have glass windows so you can see underwater...
Or this one:
2007 Stuart Catamarans Multihull Power Boat For Sale - www.yachtworld.com
It comes up in all the trawler searches, but isn't exactly a trawler in my opinion. I don't know how long it's been listed but several years at least.
Or this one... Build it and they will come? Who ever heard of advertising a boat using photoshop / cad drawings?
2013 Dickson Marine 620 Sport Cruiser Power Boat For Sale - www.yachtworld.com