Subway car office
Check this out: in the age of recycling and cost-cutting, here's a wonderful idea. In the UK, a company has decided to use a decommissioned subway car, located on the top of a building, as an office space. It's a pretty well organized shared space, with internet hook-ups, electricity and um, it's a smoking environment (yuk) since they aren't governed by the same laws as office buildings.
Check out the video on CBC.