For the past 6 months, me and my sister have been living on a houseboat (emphasis on boat).
We saw it on Craigslist, joked about doing it, then a few weeks later we're living on it. Weird? We know. Amazing and entertaining and strange? Most definitely yes.
It rocked most of the time, the weather in Seattle is unpredictable and wet, one of our bedrooms is literally only big enough for a bed, and our neighbors were 5am rowers and creepy shipping vessels. But damn, I wouldn't trade it for anything. If you ever get a chance to live in a teeny tiny boat with your best friend - do it. Do it, do it, do it.