Hey I used to have one of those. It was fun, though I didn't know that there were other ways to flip it than just open and close it with a few spins.
Are you really flipping around a sharp object, designed for stabbing people, while standing on the front end of a bike, inside a small space? lol, dud, you're asking to end up with the knife in your eye or something. Please, for your own good, stop!