WATCH: Donncha O’Callaghan in a bizarre on-field spat during his Warriors debut

Ex-Munster man Donncha O’Callaghan started his new Aviva Premiership career playing for Worcester Warriors with a win at the weekend, and also laid down a marker for those on the sideline.

During a break in play, a water-carrier for opposition side Northampton Saints was standing near O’Callaghan.

O’Callaghan reached for a bottle to take a drink, but the water-carrier obviously felt his was particularly special water - reserved for Saints’ players only.

He tried to block the bottles but Donncha was having none of it, grabbing a bottle and taking a drink.

The water-carrier, who really needs to relax, continued to try and take the bottle back but the former Munster and Ireland lock held him off with ease.

Donncha O’Callaghan 1 Grumpy water-carrier 0

Judging by their Twitter account, his new team found the whole thing hilarious.

LOCK UP YOUR WATERS! @docallaghan4 aka 'The Water Thief' ...coming to a ground near you soon! https://t.co/KCdxocbNKI

— Worcester Warriors (@WorcsWarriors) October 19, 2015