National anthem singer at Bruins-Sabres game leaves fans confused as he fumbles the words to O Canada... leading to puzzled looks from the audience as he makes up a line

A bit of a brain fart befell the national anthem singer at Tuesday night's hockey game between the Boston Bruins and the Buffalo Sabres.

Christian Kramer, who sang at Buffalo's Key Bank Center fumbled the words to the Canadian national anthem - O Canada - and ended up making up a verse.

He stumbled over the second verse, which reads: 'With glowing hearts we see thee rise, the true North strong and free / From far and wide O Canada, we stand on guard for thee.'

Kramer ended up making up some words, singing, 'With glowing hearts we see thee rise, the true North strong and free / O Canada, we stand arise we stand on guard for thee.'

This drew immediate confused reactions in the crowd - with one man holding a small child looking perplexed.

Sabres fans didn't go home happy on Tuesday night as the Bruins ran riot - winning 5-2.

Boston scored their first goal just three minutes into the first period. By the time the under-five mark in that same period hit, it was 3-0.

Buffalo was forced to pull goaltender Devon Levi after Boston scored goal number five on the night and he was replaced by Ukko-Pekka Luukkonen.

The Bruins remain atop the league with a 12-1-2 record. Meanwhile, the Buffalo Sabres sit second bottom in the Atlantic Division.