This could totally apply to debit cards for those of you who, like me, are not huge fans of the credit cards.
Please Don’t Taste My Credit Card!
I have noticed that the employees who have to handle my plastic often are careful with the card to avoid looking like they’re doing bad things with it. However, there’s always a nut somewhere 
I’m pretty sure I would freak out right there if a cashier put my credit card on their mouth. Totally gross, totally unsanitary. Who knows where my card has been – why are you kissing it? Not to mention I dont’ know where your mouth has been…..