An unidentified heckler interrupted actor Vanessa Williams as she performed the U.S. national anthem before Sunday’s NBA game in London between the Orlando Magic and Memphis Grizzlies, shouting, “Leave Greenland alone!” Williams sang The Star-Spangled Banner just before tipoff at the game at the O2 Arena and as she neared the end of the song, the heckler’s interruption was met with some applause from the crowd.