A drunk knifeman stabbed his friend to the stomach after he knocked on his front door and asked for £30.
John Russell said nothing to the 50-year-old man before knifing him, then shutting the door to his flat.
The kitchen knife was still stuck in the victim's stomach as he was able to walk away.
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Another friend started screaming after she saw the blade protruding from his body.
Russell and the victim had known each other for nine years, and the victim had been 'extremely kind' to him.
They had been drinking together all day before the victim returned to Russell's flat, and asked for £30 which he was owed.
But without warning, Russell, 45, who kept the knife on a coat hook next to the door, knifed him.
The victim was rushed to hospital and needed 37 staples to close the wound opened during surgery, leaving him with a huge scar.
Now Russell, who immediately called for an ambulance, has been jailed for two years and eight months.
Manchester Crown Court heard that Russell suffers from a 'form of disability', and that the victim would help him out on occasion.
Hours before the stabbing, they had both gone to a shop in Newton Heath to buy some cans of cider, which they spent the day drinking together.
At about 8pm on September 7 last year, he went to Russell's twelfth floor flat to ask for £30 which was owed to him.
Russell, who said he had the knife on a coat hook because he'd been attacked previously, plunged the blade into his stomach.
He then shut the door and locked it, prosecutor Duncan Wilcock said.
He added: "The knife was still left inside him. He had no idea why he had done this."
The victim was able to walk back to his flat before he was rushed to hospital.
The stabbing damaged his colon, and he faces further surgery after a hernia was discovered.
"What you did in September of last year was what I think can be best described as a moment of madness," the judge, Recorder Jason MacAdam told Russell.
"An offence committed by you in drink, which could have had the most dreadful consequences.
"The consequences have been enormous for the victim, and are ongoing.
"This was a man who up until that point was a friend to you.
"By my reading of it you accept that he had not just been a friend, but he had been extremely kind to you."
Russell accepted stabbing his friend but said he 'didn't mean to'.
Defending, Dan Gaskell said that Russell claimed the victim had been acted in 'forceful terms' when asking for the money.
Russell can't work due to his disability and turned to 'binge drinking' as a way of dealing with his problems, the lawyer said.
The judge accepted that Russell regretted his actions and was remorseful.
Russell, of Sedgeford Road, Monsall, pleaded guilty to section 18 wounding with intent.
