21 year old Greg Moore is in for the night of his life. Having just been promoted at work he has something to celebrate. He plucks up the courage to ask Laura an attractive girl from his office out for a drink. Like all humans Greg is a man with two brains. Lurking deep beneath his highly evolved and rational brain is another more primitive brain. Usually his higher brain - or cerebral cortex - rules his behaviour but tonight his animal brain - or limbic system - is going to get the better of him.