What comes first? The downgrade? Or the stock plummet?

On Wednesday, J.P. Morgan cut MVL from overweight to neutral. Oh and I love this part -

"In addition, the broker told clients it sees a pattern of stock weakness following major summer movies, which poses a modest risk after Fantastic Four's opening on July 8."

Hey J.P. Morgan - you're definitely not the only one to find stock weakness before any of Marvel's major summer movies. Yes, I noticed it before too. Who can forget the mass drop before the release of Spider-Man 2? That plummet still keeps me scratching my head.. Honestly, with the release of Fantastic Four, I was hoping to see whether or not this alleged "weakness" before openings was a myth or in fact a trend. Well - looks like I can't perform my experiment with this summer release. How are Marvel shareholders going to effectively find trends, if an analyst can just go in and downgrade the stock before the movie comes out - only to send the shares down because of the downgrade?

So really. What does come first? The downgrade or the stock plummet?

All I think this downgrade does is continue to pump in value to the stock. Using SmartMoney's price-check calculator, one can see that Marvel's stock is currently undervalued. It ended trading on Friday at $19.23, whereas the calculator sees the value at a more respectable $23.71. Since the drop to the teens around the time of the Spider-Man 2 release, I've always innately thought that the stock price was definitely too low. I hope it'll come up to the mid-twenties where it belongs. ..stupid downgrade..