So apparently this is a thing that can happen. I can't even begin to imagine the soul-crushing disappointment anyone who ever gets to see this must feel. It's just like running into a shiny before you can catch Pokémon, except this gets extra points for style. Worse, you then know that had this happened on the very next roll you'd have a shiny STARTER.
However... part of me would've really liked this to happen in one of my LP runs, because, well, just imagine the reaction. It would've been the talk of the entire internet the next day... errr, on second thought, forget I said anything.