A teenager accused of plotting mass murder at his former college told a jury he amassed a kill bag of deadly weapons in his bedroom because it was "Halloween and everyone was buying costumes".
Liam Lyburd, 19, said he was an internet troll and notes he wrote about plans to carry out an attack at Newcastle College were just an attempt to get people's attention because he was lonely.
Giving evidence in the witness box, he said he was taking six-and-a-half Valium tablets a day for his anxiety when he was arrested in November at the home he shared with his mother and sister.
He told Newcastle Crown Court he would have found it "impossible" to launch an attack on his former college because he hated to go outside.
Lyburd, who also called himself Felix Burns, has pleaded guilty to nine charges relating to making five pipe bombs, two home-made explosive devices, possessing a 9mm Luger Calibre Glock gun, 94 jacketed hollow point expanding bullets and CS gas.
He denied eight charges of possessing those items with an intent to endanger life.
Lyburd said he was obsessed by the 1997 film Hollywood Heist, which was based on real events.
Anne Richardson, defending, asked him why he had got the bag with the weapons in his bedroom when police, acting on a tip-off, raided his home near St James's Park, Newcastle.
The softly-spoken defendant replied: "It was just Hollywood Heist. It was an obsession."
Miss Richardson asked: "What were you going to do with them?"
He said: "It was around Halloween and everyone was buying costumes."
He admitted he wrote a Facebook message which paid tribute to an American High School shooter who murdered classmates because he wanted to get a reaction. "I was trolling people, I knew people would get p****d off by that," he told the court.
He said the idea was "childish".
He denied having any intention of killing people with the weapons.