Idea: One day, most of Earth's population disappears, leaving behind "the 1%." What happens when the wealthiest and most powerful people in the world only have each other to exploit?
While one percent of Earth's population is still 75 million people, how many of them can fly a plane?
Idea: One day, the President of the United States of America wakes up inside a solid, transparent, 20ft x 20ft x 20ft cube at the foot of Capitol Hill in Washington, D.C.
The only opening in the cube is a hole 2cm in diameter on the top of the cube, through which air, food, and water can pass.
A sign on one side of the cube reads: "The only way to open this cube is by dropping a nuclear bomb on it from 20,000ft above. Do not try to open this cube otherwise. You will fail. Do not try to move this cube. You will fail."
All attempts to open the cube otherwise or move the cube fail.
The cube is shielded from public view.
In addition to contaminating the capital of the United States of America, you kill its president by dropping a nuclear bomb on the cube, but if you don't bomb the cube, then the President of the United States of America will rot inside outside the United States Capitol forever.
Idea: 28 Days Later, but the virus only infects millennials.