A Toronto Maple Leafs fan got kayoed in Boston after Toronto’s 4-2 victory over the Bruins in Game 2 of their Stanley Cup playoffs series.

Nice birthday present.

Kyle Hay had just turned 23. Two days after Saturday’s incident, he’s still “a little sore in the back of my head,” he told the Toronto Star.

A video has also been making the rounds of the Oshawa native lying prone on the floor after apparently being sucker-punched following the game.

The video now has nearly 60,000 views on YouTube.

You don’t see the punch. You just see Hay lying unconscious.

Witnesses say Hay had been assaulted by an angry Bruins fan. That fan was thrown down the stairs by a friend of Hay’s and he hasn’t been seen since.

Hay was taken to hospital with a swollen cheek and cut in his mouth. He says got three staples in the back of his head and suffered a concussion.

Hay told the Star on Monday that he and his six friends were wearing Maple Leaf jerseys, masks and wearing their hair in Mohawk-style.

The trouble didn’t start immediately. But it didn’t take long before fans began throwing objects at them and heckling them.

After the game, the heckling turned violent.

Hay remembers celebrating the win, but the next few moments are a blank.

From friends’ accounts, he learned that as they descended from their seats, they saw a man “charge at me and sucker-punch me in the left side of the face.”

“According to paramedics, I was knocked out from three to five minutes,” Hay said.

Asked if he had taunted the Bruins fans and deserved this, Hay said no.

“We were outnumbered by the thousands. We would have been stupid to do that.”

Bryan Barton, a friend of Hay’s who witnessed the attack, said he understands that people would think this attack was provoked.

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But he says, “(Hay) was simply walking down the stairs to leave the building and was attacked by an angry fan. I was about 10 feet behind him, saw him fall down and then saw whoever had done it running out of the building down the stairs.”

His sister, Courtney Hay, 21, said her brother called at 12:45 a.m. from a wheelchair at the hospital.

“At first he didn’t want to tell me,” she said, adding that her brother has never been in a fight as a spectator, only while playing hockey.

She believes he was, in fact, punched and didn’t hurt himself by falling in a drunken state, as some skeptics might suspect.

“You’re not going to fall on your cheek and crack your head open,” she said. “You’d fall on one side of your face.”

Concerned friends tried to get him tickets for Monday night’s game in Toronto or Game 4 because his birthday was ruined.

However, Hay doesn’t want any special consideration.

“I don’t deserve a ticket any more than another Leaf fan,” he said. He says he’s happy to watch Monday’s game from home.

Along with being sore, his pride is wounded, he said. He is off from work the entire week as an apprentice plumber to ice his face so the swelling goes down.

His pride in his team, though, is fully intact. He says he’s embarrassed he got sucker-punched wearing the Leafs colours because he felt as if he’d shamed them, as he described in this tweet the next morning.

“Thanks to everyone for the b day love and asking if I’m ok just want to apologize to leaf nation for wearing a leaf jersey while getting ko.”