Stefon Diggs guilty of NFL's dumbest move of Week 1 and it may have decided Commanders loss to Eagles

The dumbest thing any NFL player did in Week 1 of the regular season? That was Stefon Diggs , who was guilty of a clownish touchdown celebration that cost his team – perhaps dearly.

Diggs, 32, is one of the league's most-gifted route runners.

He's elite in that respect and he showed it on a 10-yard touchdown in Sunday's game against the Philadelphia Eagles .

Diggs made Eagles cornerback Cooper DeJean think he was going one way, and then went the other way, leaving him wide open for the score.

NEW NFL FINE SCHEDULE IS GOING TO A POINT SYSTEM THAT COULD LEAD TO SUSPENSIONS BUT ALSO REFUNDS But then Diggs showed everyone perhaps the reason he's playing for his fourth team in four years when he completely lost his mind after the score.

Diggs, you see, celebrated his first touchdown with his new team by jumping on the goal post.

It's an old Antonio Brown celebration from more than a decade ago.

The NFL calls it using the goal post as a prop which is against the rules.

So Diggs was immediately flagged for the foolish move.

"As soon as I wrapped my arms around it I was like this: 'Oh I forgot,'" Diggs told reporters at his locker stall after the game.

"Back in the day, you know, I've been playing a long time, you used to could do that.

"So, update on the rules and sometimes when you've been in the game a long time, uh, I got to be better." SAINTS DEFENSE HAS TOUCHDOWN TAKEN AWAY AGAINST LIONS AFTER JARED GOFF FUMBLE IS STUNNINGLY OVERTURNED To be clear, there has never been a time when Diggs, who entered the league in 2015, could do this and not be penalized.

Using the goal post as a prop became illegal in 2006.

Anyway, no biggie right? Wrong.