Amazing hybrid cruiser bike

[herku1004]

Now look at what I fell on today browsing the internet.

http://www.youtube.com/watch?v=or2GH3CHXqY&feature=related

You can whatch the whole video if you feel like but what I posted this video for is really on 3:10

What mechanism is that? I certainly don't see any compressed air bottles. I really dig that. Anybody up to something similar in this site???