Nigel Owens had to provide Cian Healy with a little update on the laws of rugby during Munster and Leinster's game at Thomond Park.
'The hands out law changed three years ago. Where have you been?' asked Owens of Cian Healy during the first half of the game.
Healy had just conceded a penalty, shouting 'hands on' as Conor Murray stood at the base of a Munster ruck just outside his own 22.
Owens had to call the Leinster prop back for a little word, following which he jogged away with a laugh after being reminded of the laws.
Amusement from Munster fans would not last long as Owens reversed the penalty just moments later for a neck roll by second row Jean Kleyn following a referral to the TMO.