I went to Sainsbury's for a prawn mayonnaise sandwich. Nothing beats a hangover like a Sainsbury's prawn mayonnaise sandwich. All those tiny bodies swimming in viscous white. While I was waiting in the queue I saw a guy next to the magazine rack. He was drinking a can of Red Bull like it was medicine - quickly and deliberately, dealing with the burps as they came.
  Later, at a gallery opening, I watched a middle aged business man take photos with his mobile phone; on his face I recognised a similar grim determination.