I know people working in supermarkets and she definitely thought "oh for fucks sake another one of those idiots that saw a social media post of someone paying with a random object and thinking they could do the same to get stuff for free"
you'd be surprised by how many people see stuff like this and don't realize that you can't just pick an apple from the store shelf and use it to pay (besides she probably also thinks about whether or not they just stole that apple or not)
She was about to laugh.
Her smile was unmistakable.