A Maple Leafs fan at Air Canada Centre in Toronto brought a sign to Game 3 of the Bruins-Leafs playoff series that read, "Toronto Stronger,' openly mocking the phrase 'Boston Strong,' which recently became a slogan in support of the City of Boston in the wake of the Marathon bombings in April.
#Torontostronger was also trending on Twitter at one point during Monday night's Game 3.
United States and Canadian hockey fans have often had a vocal border battle, as was evidenced in 2004 when Montreal Canadiens fans booed the U.S. National Anthem in a series against the Bruins. Boston fans responded by cheering the Canadian National Anthem in the next home game of the series.
Follow Metro Boston sports editor and columnist Matt Burke on Twitter @BurkeMetroBOS