Trade with non-existent aliens. This is another bit of anecdotal evidence against Keynesianism (and against Keynes himself, as this is just a new spin on one of his ideas): if your theory ends up with destroying wealth making you richer, you may need to rethink your theory.
If it helps, instead of sinking everything in the ocean, they can just leave all it with me. After all, in terms of aggregate demand, my having all of this stuff won’t change a thing…