That's the speculation anyway the day after the Seahawks 34-22 trouncing of Cardinals Thursday night. A brief video clip going around the Internet posted by Reddit user Kookp1 appears to show Lynch give the finger to his bench after coming out of the huddle on 3rd-and-goal from inside the 1-yard line.
Rather than hand the ball to Lynch, the Seahawks instead ran a play-action pass, with Russell Wilson throwing to Kellen Davis for a touchdown.
It's hard to tell from the quick clip whether Lynch is actually flipping the bird or not, but it's making for some fun speculation.
There was no mention of it afterwards, and Lynch never speaks with the media, so we'll likely never know the truth. Maybe we can get Richard Sherman to ask if Marshawn is mad.