I am a computer programmer.
I develop applications for companies.
But they have privacy policies with their customers, so I cannot see their raw data.
So, I developed a parallel universe.
I pull the data from that parallel universe.
Because the data is identical to the data in our universe, I have all the conditions necessary to test it.
Then, I delete the data and hand over my application.
And I hand it to the company in the parallel universe.
Sure, I get paid twice for the same work, but, sadly, I also have to pay taxes in both universes.