This isn't the first time this has happened. People getting up right behind you at the self-checkout lane and watching you while you are ringing up your stuff.
That is an invasion of privacy. There should be a line to where the customers have to stand behind so they are not right up on top of you while you are paying for your stuff. These two girls (well they were in their late teens or twenties) did just that when I was in Walmart a while ago.
Made me so nervous and I couldn't pay attention to what I was doing. Please do this Walmart.
Preferred solution: Line for customers behind the person paying to stand behind at self-checkout..