A few years ago, while in college, a friend and I were working on a engine as a side project to build experience. 25% of the goals completed and he begins making excuses to not work anymore. I continues working on it and when the project was "competed", I showed it to the head of the department at the college where I was offered a job as a professor and sold the engine for 20k to the department of engineering.

The dude came back claiming recognition and compensation for his effort I told him sure.

When we met, I showed him legal paper stating the engine was patented under my name and I was the only owner.

In reality, I wanted to meet with him to breath his ass then show him the paper but I felt that would be too evil.

I was pretty mad that he came back after leaving but I can't hold good for nothing people.