Louis Tomlinson and Niall Horan shocked fans when they started scrapping on stage during One Direction's gig in Mexico this week.
The band's resident joker Louis, 20, looked surprised when he floored band mate Niall with his best right hook.
But it soon became clear the pair were messing around and the punch was fake when Niall picked himself up with a cheeky smile on his face.
'Most incredible show tonight in mexico city! Thank you soo much!! Xx,' Tweeted Niall, 18, after the gig.
The 1D boys do love a practical joke and are always playing tricks on each other.
'This lot think it's funny to come into my room and spray me in the face with a fire extinguisher,' Niall recently told Celebs On Sunday.
'When I was on the loo, they'd all come in and take pictures of me.'
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