i've worked retail and if some one did this to me i would find it creepy like creepy to the point i would be extra vigilant going to my car after my shift is over.
"Hi! I'm going to offer my own money and consideration in a passing gesture of goodwill. Hope you have a nice day!"
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"Oh my god guys can you believe that creep?"
![Cashier's favourite candy [WholesomeSubstance]](/uploads/original/631/631001.jpg)
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"Oh my god guys can you believe that creep?"