Canadian hockey fans began booing the American national anthem at Bell Centre in Montreal when Team USA played there on Saturday — sparking three fights to break out in the first nine seconds of the game, which the US won 3-1 with Canadian Prime Minister Trudeau in attendance.

The anthem singer who performed the Canadian anthem prior to the 4 Nations Face-Off championship game changed a lyric in “O Canada” from “in all of us command” to “that only us command.”