The Awesomer is listing a 1:1 scale replica of The Dark Knight's Batpod - featuring "a 650cc 4 stroke water cooled engine with direct port nitrous injection and tires that are 508 mm across." Not street legal though, so ride at your own risk, although chances are you could easily outrun anyone chasing you. Well, for a few metres at least, before losing control and smashing into a wall, bearing in mind how hard the one created for the movie was to actually ride.