It was jarring from the moment it was cued up for television viewers:

Alan Pardew … coach Alan Pardew … dancing on the sideline moments after his Crystal Palace team took a 1-0 lead in the FA Cup final, the world’s longest-running competition in team sports.

The goal came late … ish … in the match against heavily favored Manchester United, in the 78th minute, and in theory an English Premier League team ought to be able to nurse a goal advantage from there to the final whistle.

But then Pardew busted a move, and the wrath of the soccer gods was incurred.

I have seen a lot of Premier League soccer over the past seven years and I have come to appreciate that only a narrow range of reactions are appropriate, when you are the coach in that league.

Most of them have an element of aggression in them. The fist pump. Hands thrust into the air. The teeth-baring primal scream.

The hug of an assistant coach is OK. A short, crazed, wild-eyed dash to the other end of the coach’s box is fine.

And that’s about it.

Dancing is not allowed. Especially not the sort of dance displayed — facing the crowd — by Crystal Palace’s Alan Pardew.

Actual moves. It was something straight out of a 1970s discotheque, with lots of hip movement and shoulder rolling. Which would have been fine — inside a 1970s discotheque.

But never, ever in front of 88,000 fans at Wembley Stadium, and a TV audience of tens of millions more … when the game has at least 12 minutes to go and the other side is Manchester United.

One of the reporters covering the game for The Guardian — which usually would be expected to defend that sort of self expression, breaking from rigid English social bounds, etc — made a point of declaring the dance out of bounds.

The reporter wrote: “This was not the right time – if there ever is a right time, that is – for Palace’s 54-year-old manager to lose his composure on the touchline. With Palace’s players wildly celebrating with their jubilant, disbelieving, wonderful supporters in the aftermath of [Jason] Puncheon’s spectacular goal, they needed direction from Pardew upon their return to the halfway line. Organize. Concentrate. Keep your heads. It’s not over yet.”

That was the part that offended the eternal beings looking down on the sport’s Asgard — the dance that shouted “we’ve won!” but led to the gods frowning and saying: “Do not presume, mere mortal.”

Manchester United scored only three minutes later, in the 81st minute, to send the match to extra time, and Jesse Lingard scored in the 110th minute to win it for United.

What made this more painful for Crystal Palace? The club has never won one of the three major championships — in 110 years of competition.

As close as it has gotten? The FA Cup final. Twice. In 1990 … and then a mere 26 years later, today. Both times, losing to Manchester United.

Palace had that first championship in their hands in the 78th minute today, and then their coach launched himself on that ill-considered, show-boating, fate-provoking move.

Curiously, I do not see any quotes yet from Pardew pertaining to the dance move. I expect they will come, eventually.

Because his premature victory dance will be the singular moment best remembered from the 2016 FA Cup final, part of a “don’t count your chickens” trope for decades to come.