James Bond's Submersible Car
Suppose you're stuck in traffic on the Pacific Coast Highway, and you don't have a personal helicopter handy. Fortunately, you're driving Rinspeed's [[xref:http://www.rinspeed.com/pages/cars/squba/pre-squba.htm|sQuba]]. This is the first car that can float and (purposefully) sink to become a submarine. Yes, you'll need scuba gear to breath, but for $400,000, you could be the envy of all those beach-goers.