The bone-shaking "Viking thunderclap" made famous by Iceland fans at Euro 2016 has become a smash hit in the most unlikely of places -- at the Asian Cup in the United Arab Emirates.
An expression of solidarity between supporters and players, the iconic slow chant -- accompanied by a single clap in unison -- has been adopted by fans of teams including China, India, Thailand, Lebanon and Iran.
India captain Sunil Chhetri led his team of unlikely Vikings in a lusty thunderclap after the Blue Tigers thrashed Thailand 4-1 in Abu Dhabi.
Chinese fans followed suit after their team's 2-1 win over Kyrgyzstan, and it has gathered pace since.
"Nobody does it like we do of course -- but it's really cool that more countries are using it to support their team," Hilmar Jokull, vice chairman of Iceland's noisy Tolfan supporters group, told AFP.
"We're just a tiny country in the middle of nowhere and we're not expecting anyone to copy us -- especially countries of more than a billion people.
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"The Viking clap gets the players pumped up," he added. "It gives them an adrenalin shock." Iceland, with a modest population of just 340,000, famously reached the quarter-finals of Euro 2016, knocking out England along the way.
Their passionate fans also won admirers around the world, although -- whisper it -- the thunderclap actually originated in Scotland, and supporters of Icelandic side Stjarnan pinched it after a Europa League game in 2014.
"They took it from Motherwell, but I think it's similar to the technique Vikings used when they were sailing," insisted Jokull.
"Banging a drum to keep the rhythm going while they were rowing."
- 'Samheldni' -
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Wales and France also celebrated victories at Euro 2016 with impromptu versions of the Icelandic chant, which gradually gathers speed and ends with a throaty cry of