Pub-goer performs incredible trick with pint of Guinness and packet of crisps

This man can perform an almost impossible bar trick with nothing more than an empty crisp packet.

A customer at the Upstairs Downstairs bar in Londonderry, Northern Ireland, is faced with the ultimate of pub dilemmas – an upside-down pint.

But the skilled patron doesn't let this faze him.

He opens up a crisp packet and flattens it out.

Using a steady hand, he slides the pint of Guinness onto the crisp packet and folds it up around the glass.

"Take your time," his friends tell him before he inverts the stout.

Amazingly, not a drop was spilt.

The stunned barman said he had "seen it all".

The clip was filmed on October 11.