This weekend I was away on vacation and I read something about Macbeth being attributed to Thomas Middleton instead of Shakespeare. I know about many of the plays in questionable authorship, but I didn't know that Macbeth was one of them.
When I got home and caught up on my newsfeeds I found another article suggesting that Shakespeare stole Macbeth from a Scottish monk named Andrew de Wyntoun. The standard article follows, some historians show examples where the original looks similar to what Shakespeare wrote, and then a Shakespeare scholar presents the standard defense: "Yes, we know that Shakespeare borrowed things, he admitted it freely. The point is that when he rewrote it, his version was much better than the original."