Oh, the joys of sticking it to a particularly evil boss. I got this exact same satisfaction when I left my job working on sounding rockets. The boss was a micromanager who was eventually demoted (and then left the company) after I left, because he had driven away more than half his department.

Two days before I left, he had been threatening, in a roundabout way, to fire me. But when I handed in my resignation letter, he was eager to keep me and asked what it would take to keep me. I named the salary my next job was offering. "You'll make more than I do now!" he said.