Just go to every jail in the country, and move all the signs at the entrance doors and gates, transferring those on the outside to the inside and vice-versa. Thus, the sign showing the name of the prison will be on the inside, and the one saying “exit - please don’t pass through this door if you aren’t supposed to” will be on the outside.
Yeah, that kind of fits right in with the idea Neill started and I finished. Now we just need to find someone to writethe script.