Before you have a go at me for picking on shop assistants I've worked in retail as a shop assistant for ten years before having children and changing jobs. I know what it's like.
I got served today in the CoOP by a girl who was sucking the arse out of a carton of Ribena. She didn't take the straw out of her gob and did the transaction with one hand. She went SLUUUURRRP all the way through.
Then when it was done, another staff member asked her where something was so she took them to it with the carton still stuffed in her face and slurping...she removed it for one second to say "Oh I know..." and then rammed it back in.
Sorry but it was both gross and rude imo. Don't they have rules about eating and drinking behind the tills any more?