Man jailed for attack.
Mark Coyles's only previous brush with the law was getting drunk at a football match.
But the father of two fell into a bar-room argument with John Dodds over an earlier incident neither had even been involved in, Newcastle Crown Court heard.
And as the row became more heated, he swung a punch at Mr Dodds without realising he still had his glass in his hand.
The glass shattered, causing a cut to Mr Dodds's cheek which needed 30 stitches and only an inch from his eye, the court heard.
Coyles, 28, a Goodyear Corporation tyre inspector from The Cove, Shiney Row, near Washington, admitted unlawful wounding.
Jailing him for 18 months, Judge David Wood told him: "You caused Mr Dodds an extremely unpleasant injury which will leave him scarred for life."