The casually dressed dad stuck his foot out as the winning side was about to romp in yet another try.

A teenage rugby player has recalled how he was tripped by a ‘touchline dad’ just as he was about to score a try describing the man as “a naughty schoolboy”.

Winger Harry Bayford was bearing down on the line when the father stuck out a leg to stop him scoring his third try of the game.

The man is believed to have been a father of an opposing player who lost his temper as his son's team were on the receiving end of a heavy defeat

“I was running down the left hand side towards the line and this guy was standing on the sideline, although I didn’t really notice him," the teenager told the Daily Telegraph.

“I turned around to push one of the opposition players and he suddenly just stepped out of nowhere in front of me.

“I flipped completely over and my head went where my legs should have been. I just lay on the ground and looked up at him.

“I didn’t know what to say. It was such a weird thing to do.”

The referee of the Hertfordshire Shield cup final sent the spectator off from the side of the pitch following the incident.

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Harry, from Royston, England told of how the man was berated for his conduct by other parents.

He said: “He looked really guilty, like a little schoolboy who’d done something naughty.

"He tried to walk away as if nobody had seen what he’d done, which was obviously ridiculous.

“One of the women nearby went absolutely nuts at him. She was saying ‘Why did you do that? You’re supposed to be a grown-up. What kind of example are you setting to the kids?’

“People around didn’t know what to do because no one had ever seen anything like that.

“My captain wanted to deck him, so it’s probably a good thing he got taken away.”

Harry picked himself up following the trip and scored his third try only a minute after the game was restarted but after the game the teenager realised he had a painful bruise on his leg where the reckless father’s knee had clattered into him.

The teenager said he was even considering legal action against the unidentified man.