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One rowdy punter bit off more than he could chew when he confronted the wrong security guard – a former British heavyweight champion and one-time Mike Tyson opponent who left him knocked out cold on the pavement.

The video clip from Box Park in Wembley shows an altercation between a group of men and security staff outside the venue.

Julius Francis, now 57, is pictured amid the melee, initially seen keeping his distance.

But as things begin to boil over, one of the men takes a swing at another which narrowly misses.

The same man then advances towards Francis who takes a step back before throwing a lightning quick right across that drops him and leaves him out cold.