One day, a coworker we had never heard of approached us and asked to answer an exhaustive set of questions about our POC. I did.
Subsequently, he asked for a detailed cookbook to reproduce the whole thing. I gave it to him. He was dumb enough to not be able to understand/use it even with everything in hand.
After a week, he freaked out and said there were a team of 8 in a foreign country at client location (been for 6 months) getting paid to implement the prototype. They got nothing!
My CTO steps in and says, "The project delivery is in danger, so you work on the whole thing and finish it, and those 8 guys will pretend to the paying customers that it was their work and will forward any further questions to you again." I claimed it was unethical, (to claim credit for someone else's work), and that I'd be happy to work on that project, as long as my name was on it. The customers knew me because everything started with my presentation of the POC earlier.
CTO said No, and I walked out.
Probably the best decision I made myself. I switched jobs, saved some money, went to Grad school, and at a better job now.