That's perfectly executed white-board snark, right down to the punter with the single-bar facemask.
Vikes punter Chris Kluwe(notes) Tweeted the picture on Thursday night, but didn't claim authorship. The message is likely in response to a clip in the video of Seattle Seahawks punter Jon Ryan(notes) getting flattened on a punt return. The hit was praised as clean.
I'm beginning to think it wasn't the best idea for the NFL to pick a new fight with the player's association right before negotiations for a new labor agreement are set to begin.