A convicted prisoner received a bloody welcome to HMP Bristol.
On his first day on B Wing Tommy Roberts was collecting hot water from a bathroom when he was pummelled by two inmates.
Though one attacker was not identified the other man, Thomas Radley, admitted battering Roberts with a table leg converted into a club.
And when prison staff found Radley had another lethal weapon in his cell, Radley conceded the e-cigarette with a screw attached was his "pride and joy" and he intended to use it on someone's neck.
Radley, 26, of no fixed address, pleaded guilty to assault occasioning actual bodily harm and having a weapon in prison.
He refused to instruct a solicitor and declined to attend court for sentence.
Judge Mark Horton jailed him in his absence for three years and four months.
Neil Treharne, prosecuting, said Radley and the other assailant used a weapon and blows to floor him before kicking him to the head in a "frenzied attack".
He was left covered in blood and had to have stitches in his cheek and mouth and a head injury glued.
Bristol Crown Court heard Radley had a history of violent offending, including robbery, assaults on police and a previous prison cell-mate.
The judge told the court: "I find it absolutely extraordinary he was charged with actual bodily harm."
He is seeking an explanation on charging from the Crown Prosecution Service.
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