If you watch the movie full throttle i guessed this how they got the idea Must watch the whole links even if its in japanese still worth to watch.

http://www.youtube.com/watch?v=AcFmzVP06mI
http://www.youtube.com/watch?v=o4pL7FObqds
http://www.youtube.com/watch?v=gPvnaP8zjDA
http://www.youtube.com/watch?v=ldTwmeqEqVQ
http://www.youtube.com/watch?v=2Qii4n3ZMV8