Hundreds of Irish people have reacted in horror after a pint of Guinness was poured in an "sacrilegious" way in a pub in London.
A picture shared on popular social media page, S**t London Guinness, shows a pint of the black stuff served to a customer in Belushi's, London Bridge.
The iconic drink should be black with a creamy white head and is supposed to be poured in two parts and left to settle to serve it correctly.
