I know not everyone is a football fan, so let me give a brief intro - Clay Matthews plays for the Green Bay Packers. He is awesome. He is the son of a former awesome player, also named Clay Matthews and his uncle is Bruce Matthews who was also, well, awesome.
The current Clay Matthews is a devastating defensive player, smaller and faster than his Dad was (imagine Nightwing taking over as Batman).
Anyway, Clay has my favorite celebratory dance in football after he mauls someone on the gridiron.
I don't know if he is intentionally taking a "Predator" stance, but I have to believe he is. Either way, to paraphrase Arnold, he is "one ugly muddaf-----!"
See for yourself