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@tynan
Even better would be to give them time to get up to escape speed, using a timer of some sort, it would have to be simple and mechanical to be reliable.
For instance bonding/welding the BB cup to the crank arm - removing the crank bolt and tapping the arm loose + removing the lock ring - so on the surface of it you just have a bike with a loose crank . . .
. . . but as this bloke pedals off - the fact that the BB cup is wielded to the crank arm and the crank arm is loose means he is slowly unscrewing the BB cup and pushing the crank arm off.