MONTREAL — Samuel Montembeault slid right by his post and watched as the shot flew past him and into the far side of his wide-open net.

It didn’t come from Alex Ovechkin, the greatest goal scorer in history, who had already beaten him with the first shot of the night for the 905th tally of his career.

No, no, the shot came from fourth-line winger Ethen Frank, who came into Thursday’s game with all of four NHL goals to his name.

Frank then suddenly had six after beating Montembeault clean just 1:38 after shooting the puck right through him to give the Washington Capitals a 3-1 lead.

The No. 1 goaltender of the Montreal Canadiens then surrendered his net after literally surrendering his net.

Montembeault had stopped just seven of 10 shots — some of them seemingly by pure fluke — before

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