Imagine a piston engine in which the cylinders are the size of the Vehicle Assembly Building and the spark plugs are replaced by nuclear bombs.
While you're at it the thing might as well be placed into orbit. Imagine the generating potential without the effect of gravity on the thing.
That would make for one heck of a power generation station... How 'bout this: use the thing to power a huge laser. Use the laser to propel a solar sail... One of billion other potential uses.
Well you think you've heard every insane idea imaginable, but every once and a while people surprise you.
Tip o' the hat to Joseph Hertzlinger.