Hong Kong Sevens: Former French star Sebastien Chabal entertains crowd with The Proclaimers cover

Every All Blacks fan will remember former French number eight Sebastien Chabal.

Chabal, known for his caveman-like appearance, was at the heart of France's epic 20-18 win over the All Blacks at the 2007 Rugby World Cup.

Ever wondered what the 41-year-old is doing now? Well, he's still involved in rugby, but in a unique way.

The 62-test veteran turned up at the Hong Kong Sevens on Friday (NZ time) dressed as a caveman, and began singing 'I'm Gonna Be (500 Miles)' by Scottish band The Proclaimers, who are in New Zealand next month.

Commentator Sean Maloney couldn't stop laughing as Chabal sang while three other men dressed in caveman outfits played instruments.

"What more could you want on a Friday morning? I've never seen anything like this on a rugby field," he said.

"This is the best. I've seen it all."

Chabal is in Hong Kong for the tournament as he's the face of an advertising campaign for Marriott Bonvoy, which is sponsoring the event.

Meanwhile, New Zealand won their opening game at the Hong Kong Sevens with a 40-19 win over Australia.

They still have two more Pool games against Kenya and Fiji to be played on Saturday.