Years ago I started writing a short story called “The Invasion of Privacy”. The plot was that a scientist had figured out how to focus “gravity waves” over a distance, so you could see a (black-and-white) image of anything going on anywhere in the world. Sound worked too, by measuring the vibrations of air molecules. These ultimate spying devices were about the size and cost of a television and became just as popular, which effectively put an end to privacy for everyone.
Want to see what your enemy is plotting behind closed doors? No problem! See what your spouse is doing when you’re not home? Easy! Like porn? You can watch anyone doing anything, anytime, for free! Lying and deceit became very hard to get away with. Secrets became a thing of the past. Honesty finally really did become the best policy, because everything you did was probably being watched by someone.
Little did I know that it was prescient. Well, except only for the NSA. Sigh.