Before the idea was announced, one of my coworkers, a PR guy, shared the idea-my idea-with the CEO and CMO. While he didn't exactly say he'd done the work himself, how he talked about it made it seem like it was all his.
A few years ago, I put together what I felt was a truly innovative concept, which I presented in a conference poster at an international meeting in my field. After the presentation, I spoke to another early-career scientist about my work and how it might apply to their findings. Two years later, they scooped me by publishing a preprint paper that presented my idea, with many of the same verbal formulations and an identical flow of ideas, without any acknowledgement or attribution to my work.