On 20 October 1973, Richard Nixon attempted to shut down the Watergate investigation by firing special prosecutor Archibald Cox. Two senior Justice Department officials resigned rather than carry out the order. The resulting ‘Saturday Night Massacre’ accelerated Nixon’s downfall and became a definitive moment in the abuse of executive power. Ten years later, scientists in Paris redefined the metre using the speed of light, anchoring human measurement to a universal constant rather than a metal bar in a vault. And in 1995, a Mumbai cinema began screening Dilwale Dulhania Le Jayenge, a film that would run continuously for decades, becoming an institution in its own right. Three stories about moments when authority collapsed, precision improved, and audiences refused to let go.