With a version of the show airing in almost 70 countries, Big Brother might be the most popular reality competition on the planet. What makes it compelling is the fact that episodes are filmed by way of cameras that are implanted in the walls and ceilings of the Big Brother house, which encourages contestants to act more naturally than they would with a boom guy standing over them, and lets them whisper their secrets and betrayals in perceived privacy. It also gives audiences a very fly-on-the-wall feel that’s missing from other shows in the genre. The results should have psychologists scratching their heads for years, as Big Brother’s rats-in-a-cage format produces some very Lord of the Flies moments.