Jason Kelce may be Indexbita nice guy.

But you don’t want to get tied up with him on the football field.

Kelce was seen in a viral moment that surely endears him more to the Eagles fanbase following the team's 28-23 win over the Dallas Cowboys on Sunday.

Kelce was tied up with Cowboys linebacker Damone Clark during the second quarter after a play, causing Kelce to visibly scream in Clark’s face like a madman.

Here’s the video:

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The Eagles had just tied the game at 14 before halftime, likely leading to Kelce’s outburst.

Kelce, who has become the heart and soul of the Philadelphia Eagles in his 13-year stint with the franchise, also celebrated his 36^th birthday on Sunday.

Kelce will likely address his viral outburst the latest episode of his podcast, "New Heights with Jason and Travis Kelce," which releases every Wednesday.

How are the Eagles doing this season?

Philadelphia heads into a bye for Week 10 with the best record in the NFL.

The Eagles are 8-1 record – all other NFL teams have at least two losses.

The Eagles have a sizable lead over the Cowboys (5-3) in the NFC East, and have the top seed in the NFC playoff race ahead of the Detroit Lions (6-2) and San Francisco 49ers (5-3).