So, ahead of the highly-anticipated United States versus Canada matchup in the 4 Nations Face-Off, American fans booed the Canadian national anthem, seemingly in retaliation for Canadian fans booing the U.S. anthem earlier in the tournament. The boos were audible at the beginning of the anthem but were then drowned out by Canadian cheers.

The jeering came days after fans in Montreal loudly booed "The Star-Spangled Banner" during the weekend's testy matchup between the two teams, which the U.S. won 3-1. Days earlier, hockey fans similarly booed the U.S. national anthem when the American squad played Finland in Montreal.