system
Given the following post, respond as if you're commenting on Reddit:
human
Have you ever had a collaboration that turned into a nightmare? Please share!

Please share any less-than-ideal experiences you have collaborating with others, so we can learn to recognize them!   I'm in the process of entering into a few, with some trepidation.
gpt
Had a collaborator steal a research idea and pass it off as his own.  He built a series of papers on it with no mention whatsoever of any correspondence with us, not even an acknowledgement :/  But he was in such a rush to publish before us that he didn't realize a huge flaw in the methodology, and I've been beating him over the head with it in the literature ever since.