'Ignored, abused and underpaid, the unsung heroines of the food chain are suddenly in the spotlight thanks to French till tapper Anna Sam.' The Sun Can you scan 800 barcodes an hour? Can you smile and say 'thanks' 500 times a day? Do you never need to go to the toilet? Then working at a supermarket checkout could be just the job for you. Anna Sam spent 8 years as a checkout girl. Checkout: A Life on the Tills is a witty look at what it's really like...