Check out this mean looking motorcycle that was designed by students at the San Jose State University. The team used giant balls, instead of a wheel that is restricted to one axis of movement to create this rideable electric motorcycle.
By using the giant balls, their device is omnidirectional and has a great deal more freedom of movement. Its design is similar to the Audi RSQ used by Del Spooner (aka Will Smith) in I, Robot. It also works on many of the same principals as the omnidirectional robot Rezero seen in this video clip.
If we ever see motorcycles on the road, like the ones designed by these students, expect to see them perform some pretty nifty tricks and parallel park effortlessly.