What a crappy way to treat your dad.

Dwayne "The Rock" Johnson has posted a photo of the exact moment his eight-month-old daughter pooped on him.

The 44-year-old movie star told his Instagram fans that the messy mishap took place on Monday.

A photo posted by therock (@therock) on Sep 5, 2016 at 9:19am PDT

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"In the spirit of Labour Day, I had an amazing philosophical conversation [with] my baby girl about the value of hard work and how respect is given when it's earned," he wrote in the caption.

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"I told her, 'Baby girl when you grow up, you get out there and dent the universe through hard work and sweat. And always make sure you do it in a positive way with class, dignity and respect.'

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"She responded by pooing on me in this moment as she plays her favourite game, 'Drum time on daddy's big head'. It was a good talk."

Johnson's daughter, Jasmine, was born in December last year.

She is Johnson's first child with his long-time girlfriend, Lauren Hashian, who he met when filming The Game Plan in 2006.