A pub doorman suffered a broken nose after he was attacked by two brothers.
Liam (25) and Leighton Burrell (28) were each jailed for two years for the unprovoked assault.
The incident happened in the courtyard of the Bull's Head, Ashby.
The victim had to have a metal plate inserted in his nose. The injury means he can no longer continue with his hobby of boxing.
He also sustained a hairline fracture to the bone under his right eye and bruising.
The brothers both admitted causing actual bodily harm at the Market Street pub on December 15.
Alan Murphy, prosecuting, told Leicester Crown Court the victim was on duty as a door supervisor.
He said: "He was walking around the courtyard at 10.10pm, when he encountered the defendants.
Leighton Burrell, of Frederick Street, Burton-on-Trent, said to him: "Why are you acting the hard man, walking around like you can knock anybody out?"
The doorman told him: "I'm not.
"I'm just looking around, checking everything is okay, doing my job."
Leighton Burrell then bet the victim £50 he could knock him out with one punch.
The doorman tried to keep the situation jovial.
However, Liam Burrell, of Long Street, Burton-on-Trent, pulled his sleeves up and punched him "numerous times" to his head.
He then held the victim, while his brother punched him in the face. Some of the attack was caught on CCTV.
Staff and customers pinned the defendants to the ground until police arrived.
The victim had to take time off work and suffered "months of pain".
He said in a victim impact statement: "None of this was my fault and I didn't deserve it to happen to me."
Mr Murphy said: "One of his activities was boxing and he can't risk being hit on the nose because of the metal plate."
Sentencing, Judge Robert Brown said: "It was mindless, unprovoked violence."
James Macdonald, for the defendants, said: "It was all down to drink and they would benefit from assistance in addressing their drinking.
"It wasn't premeditated."
Both men have been barred from the pub.
