Nearly 30 years ago, I worked for a tiny li'l anti-virus software company that got acquired by one of the big boys, and everyone's performance-based options they were holding were suddenly worth a lot. Being hungry for career growth at the time, I'd left the company and forfeited those options. Less than 6 months later, they announced the sale of the company.
My options woulda been worth a few million at the time, maybe double that in today's money. Importantly, it would've set me up with a nice house, car, etc, without any debt, in my early 20s.