When we were standing in line at the cashier counter, my daughter asked me why the woman was firing the items bought with her laser gun. So, I looked at the cashier and checked what my daughter was referring as a laser gun and to my surprise, she was referring to the barcode scanner. She thought that the barcode scanner was a laser gun. 
Anyway, I explained to her that it was not a laser gun but a barcode scanner used to scan prices of items bought. I explained that these were the cashier’s tools to make her work easier and faster. After the explanation, my daughter told me that she wanted to be cashier when she grows up someday too! LOL!
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