NFL fans saw Kansas City Chiefs star Travis Kelce slamming his helmet down on the sidelines in a stunning live television moment.

The tight end aired out his grievances during the Chiefs ' 20-17 loss to the Philadelphia Eagles in a Super Bowl 59 rematch at Arrowhead on Sunday.

Kelce was clearly animated on the sidelines in a now-viral sequence that was captured on social media just before halftime.

The Chiefs were up just 10-7 as Kelce slammed his helmet and appeared to scream, "I'm sick of this s***!"

It's not known what Kelce was yelling about, as it came during his team's touchdown drive to make it a three-point deficit in the second quarter.

Nonetheless, NFL fans reacted on social media to Kelce's sideline rage.

"Lol I get passion but get a grip Mr. Swift," one wrote.

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