The famous question on John Skeet Facts has a rather unusual edit history.
It shows that the question was asked on November 20th, 2008. But when Bill The Lizard posted the question, he had a link in it to this blog post - which was posted on November 25th, 2008. Five days later. It would make sense if the link was edited in after the blog post was made, but the edit history does not show that link being added as an edit to the post - it shows it being in the original question.
How is that possible?