Sainz and Norris battle for epic onboard Milk Challenge!

Carlos Sainz and Lando Norris, McLaren's dynamic F1 duo, are always up for a challenge in which they can wind each other up.

The pair were brought together earlier this year ahead of pre-season testing by Sky F1, with each driver lapping the Circuit de Barcelona onboard a McLaren 570S while the other, strapped in the passenger seat fired off a series of personal questions.

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While the Q&A session was frantic between, especially for the man in the passenger seat, things turned really messy thereafter when they entered the crucial 'Milk Challenge' part of the segment.

We say no more as that would spoil the fun - or rather the milk, so check out the comical video.