Will Need A Large Drink After This

(A customer places an order in drive-thru. I give them their total and greet them at the window.)

Me: “Hi, your total is [total].”

Customer: “Sorry, can we add a large drink to that?”

(I ring it in and give them their new total.)

Me: “Okay, with the drink your new total is [$3.00 more].”

(She hands me enough money for the original total.)

Me: *counting the money* “Sorry, I just need another $3.”

Customer: “Okay.”

(She doesn’t move, just smiles at me.)

Me: “Sorry, you were $3 short. Your total was [total] and you only gave me [amount].”

Customer: “…”

Me: “…I need another $3.”

Customer: “I’m just trying to figure out why it costs more now.”