Iceland have wildly exceeded expectations by reaching the quarter-finals of Euro 2016, with their spirit, commitment and organisation on the pitch helping them to overcome bigger nations like Austria and England.
They have also benefited from the backing of arguably the loudest and most organised set of supporters at the tournament, with Iceland fans' Viking Who Klapp chant now being replicated by followers of other nations.
And Goal has got the lowdown on the chant - which has links to Vikings, rowing and Scottish side Motherwell - by Iceland's hardcore supporters. Watch the video above to find out more.
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