McDonald's share price just plunged over 3% on massive volume. For now, there is no clear catalyst for the move...

There is some unconfirmed desk chatter of a negative note from M Science in circulation with regard domestic comparable sales.

"Not Lovin' It!"

This MCD move is knocking 25 points off The Dow.

Of course, some have claimed that this weakness may be backlash from recent revelations about McDonald's employees saying they are encouraged to underfill cartons of fries.

'I worked at McDonald's and they taught me how to pinch the fry carton just right while putting the fries into them so that it looked full, but actually wasn't.

'I only had 1 customer call me out on it. He shook the fries out into his bag and poured them back into the fry carton himself and it only filled up half way, so I had to give him more fries.

However, the fast food giants have strongly denied the claims.