Maybe the lack of oxygen from spending days on end in his bedroom at his mum's house finally got to him - I mean why else would this idiot think it would be a good idea to go anywhere near an airport while dressed in black and carrying replica firearms...
http://www.birminghammail.co.uk/news/midlands-news/gun-toting-cosplay-gamer-heading-12904017

http://www.birminghammail.co.uk/news/midlands-news/gun-toting-cosplay-gamer-heading-12904017
Mr Evans tweeted the picture from his account @itsKapoow with the caption: “Some guy thought it was clever to walk through Birmingham Airport with a gun.
“Five armed police. What a fool.”
Mr Evans said he thought the young man was heading to Insomnia60 – the UK’s biggest gaming festival – and had dressed up for cosplay, short for costume play.
Another passer-by said: “The poor lad looked scared to death.”