All existence on the edge
The entire universe is unstable. Suddenly it could change all its physical game rules. That would be the definitive end of happy hour for humanity.
In its earliest moments after the Big Bang something counterintuitive happened. In much less than the wink of an eye the entire universe underwent a monstrous growth spurt, faster than the speed of light. Three physicians are now receiving the Kavli Prize for astrophysics for conceiving of this incredible cosmic inflation.