The world's top referee Nigel Owens may strike fear into rugby players, especially when he's reaching into his top pocket, but he's shown he's easy to scare.

The Welshman posted a hilarious video on social media of being shocked awake during a nap.

"When your cousins sneak in and wake you up from your Sunday afternoon nap," Owens posted on Twitter.

Meanwhile on the field, Owens has again made a point of protecting the values of the game, forcing Racing 92 winger Simon Zebo to apologise for taunting an opponent.

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Zebo's late try in Racing 92's 44-12 win over Ulster in the European Champions Cup capped of an impressive performance by his side, but was overshadowed by his actions in the build up.

As he headed for the line, Zebo pointed at opposition fullback Michael Lowry in a mocking gesture, which did not impress Owens.

"I don't think you need to do that so I suggest you apologise to him for that, please. Apologise," Owens said.

Zebo obliged, placing an arm around Lowry and shaking his hand.

The intervention came just a week after the Welsh referee awarded a penalty against a Clermont player who mocked an opponent for knocking on close to the try line a Challenge Cup game against Northampton.