OK. Super Quick Summary:
Techies had created a 'Doom' / 'Quake' style shoot em up with zombies / ghouls in wedding dresses etc. Installed it into an arcade game in a pub.
Student plus mates comes in, buys a pint, plays game.
During game DB triggers certain flashes into the gameplay on console.
Yoof enters catatonic / sleep state. Friends seems surprised but don't go mental.
DB then puts 'victim' onto stretcher. Wheel him, with mates to a warehousey place (which actually served as the layout for the game).
Puts victim in room.Gives him a big gun (like in the game) and gets evervyone out.
Triggers foghorn sound to 'reawaken' victim and yoof awakes.
On cue, actors wearing zomby suits walk into the set... you know like 'Awakening the dead' style / arms out etc... another actor is playing the 'wedding bride zombie'
Yoof goes mental, scared f*ckless, and shoots everyone (presumably with some kind of paintball gun.
Zombies progress towards him, yoof escapes into little side room, then foghorn sounds to put yoof back in trance.
He's wheeled on the stretcher out of the warehouse, back to the pub and placed infront of the gaming machine.
Yoof is reawakened and then debrief by DB and shown the video footage of him in the warehouse shi**ing himself and him trying to shoot all the zombies.
To avoid being sued (???) all the zombie actors are then introduced to the yoof.
End of.