tl;dr: An early NVIDIA technical advisor from 1993 discovered decades later that his stock options should have vested over four quarters, not four years as the company claimed at the time, leaving him short 9,375 shares—now worth roughly $1 billion after splits. Though NVIDIA didn't dispute the authenticity of the original option agreement, his attorneys concluded the statute of limitations made litigation futile after 30 years. He shares the story as a cautionary tale about promptly enforcing contractual rights.