i have seen police on segways: they get laughed at a lot. these new segway-type trikes were just purchased by washington metro police for aiding them in parking lot burglaries:
cool amphibious manufactures international makes crazy stuff! in addition to water-friendly cars, trucks and tour buses, they have designed and manufactured this amphibious biodiesel motorcycle, the biotrike. this thing has it all: it's aerodynamic; a plug in hybrid electric-biodiesel; is handicap-capable, has a safety roll cage, and costs about $24,000. not totally sure why you would want to go in the water with this trike: maybe just for the novelty of it all or maybe you live in an area with heavy downpours!
blastolene's rocket II debuted at the 2009 grand national roadster show. designer michael leeds won the top award for "best engineered". i don't really get it, though: you sit behind the engine? that's ridiculous! nice design work in the shop...not very practical in the real world. still looks cool!
for about $9k you can get 141 mpg! piaggio's mp3 hybrid scooter can be plugged in or runs off of its gas powered generator. the 400 model goes 88mph! kind of weird looking!