Truly, a man of the people.And let's not forget, this isn’t Kelce's first wild appearance with Bills Mafia. Who could forget when he showed up shirtless in the suites during Buffalo's AFC Divisional Round matchup with the Chiefs last season?

The ESPN broadcaster mingled with members of the Bills Mafia before the team took on the New York Jets on Monday, Oct. 14

In a video shared before the Bills' matchup with the New York Jets on Monday, October 14, Kelce, aged 36, was spotted wearing a Fred Flintstone costume and sporting a vibrant blue furry Bills hat, as he took Gatorade shots from a bowling ball.

Before kickoff, former NFL star Jason Kelce joined Bills Mafia outside MetLife Stadium. Dressed up as Fred Flintstone, he took shots of Gatorade from a bowling bowl. The 36-year-old abstained from drinking as he needed report for duty as an analyst on "Monday Night Countdown."

Jason Kelce sported his best Buffalo Bills themed suit along with a Water Buffalo Club hat during Monday night's primetime game at MetLife Stadium.

Jason Kelce is being welcomed into the Buffalo Bills family with open arms — and leaning into the Halloween season full throttle. In a video posted via X ahead of the Bills game against the New York Jets on Monday Kelce,

It was a chaotic reunion months in the making. Jason Kelce reveled with Bills Mafia on Monday before Buffalo’s prime-time clash against the Jets at MetLife Stadium, 10 months after the retired Eagles center partied with those same fans before a playoff matchup between the Bills and younger brother Travis Kelce’s Chiefs.

Jason Kelce is being welcomed into the Buffalo Bills family with open arms - and leaning into the Halloween season full throttle. In a video posted via X ahead of the Bills game against the New York Jets on Monday,