Everytime I go to Sainsburys I look at the top novels they have. I''ve bought a few good crime and thrillers from there as they only stock popular books (they're very well priced as well).
Today, I saw that the amazing Jeffrey Deaver has released a book that is the same as an idea I had a couple of weeks ago. I have ideas all the time - every day - most of which don't make it to paper (screen). Obviously, I've not had my idea copied (and it was just an idea); I'm not accusing one of the greatest crime / thriller writers of the modern day from copying from an unpubished nobody.
However, I walked away from the supermarket feeling pretty good for myself. I thought, at least some of my ideas may be publishable in principal.
I was just interested, has it ever happened to you?