We won't speculate why Eagles wide receiver DeSean Jackson is so fired up (because, really, who knows?), but he was seen on the sidelines of Sunday's game with the Vikings flapping his gums in the direction of Michael Vick, Riley Cooper and/or Jeff Maehl before Jason Avant intervened.
In related news: The Vikings defense has jokes (at Jackson's expense).
You can follow the Eagles-Vikings game here.
.GIF via FanSided
